glacier/vault: Fix spurious policy diffs

[YakDriver]

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Relates #21968

Output from acceptance testing (us-west-2):

% make testacc TESTS=TestAccGlacierVaultLock PKG=glacier
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/glacier/... -v -count 1 -parallel 20 -run='TestAccGlacierVaultLock' -timeout 180m
--- PASS: TestAccGlacierVaultLock_basic (20.78s)
--- PASS: TestAccGlacierVaultLock_completeLock (21.68s)
--- PASS: TestAccGlacierVaultLock_ignoreEquivalentPolicy (28.26s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/glacier	29.892s
% make testacc TESTS=TestAccGlacierVault_ PKG=glacier 
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/glacier/... -v -count 1 -parallel 20 -run='TestAccGlacierVault_' -timeout 180m
--- PASS: TestAccGlacierVault_disappears (15.40s)
--- PASS: TestAccGlacierVault_basic (22.40s)
--- PASS: TestAccGlacierVault_ignoreEquivalent (29.49s)
--- PASS: TestAccGlacierVault_tags (51.03s)
--- PASS: TestAccGlacierVault_policy (52.05s)
--- PASS: TestAccGlacierVault_notification (55.88s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/glacier	57.405s

Output from acceptance testing (GovCloud):

% make testacc TESTS=TestAccGlacierVault_ PKG=glacier
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/glacier/... -v -count 1 -parallel 20 -run='TestAccGlacierVault_' -timeout 180m
--- PASS: TestAccGlacierVault_disappears (17.97s)
--- PASS: TestAccGlacierVault_basic (24.97s)
--- PASS: TestAccGlacierVault_ignoreEquivalent (35.61s)
--- PASS: TestAccGlacierVault_tags (58.81s)
--- PASS: TestAccGlacierVault_policy (61.93s)
--- PASS: TestAccGlacierVault_notification (63.58s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/glacier	65.247s
% make testacc TESTS=TestAccGlacierVaultLock PKG=glacier
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/glacier/... -v -count 1 -parallel 20 -run='TestAccGlacierVaultLock' -timeout 180m
--- PASS: TestAccGlacierVaultLock_basic (25.84s)
--- PASS: TestAccGlacierVaultLock_completeLock (26.52s)
--- PASS: TestAccGlacierVaultLock_ignoreEquivalentPolicy (35.29s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/glacier	36.922s

[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccGlacierVaultLock_\|TestAccGlacierVault_' PKG=glacier
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/glacier/... -v -count 1 -parallel 20 -run=TestAccGlacierVaultLock_\|TestAccGlacierVault_ -timeout 180m
=== RUN   TestAccGlacierVaultLock_basic
=== PAUSE TestAccGlacierVaultLock_basic
=== RUN   TestAccGlacierVaultLock_completeLock
=== PAUSE TestAccGlacierVaultLock_completeLock
=== RUN   TestAccGlacierVaultLock_ignoreEquivalentPolicy
=== PAUSE TestAccGlacierVaultLock_ignoreEquivalentPolicy
=== RUN   TestAccGlacierVault_basic
=== PAUSE TestAccGlacierVault_basic
=== RUN   TestAccGlacierVault_notification
=== PAUSE TestAccGlacierVault_notification
=== RUN   TestAccGlacierVault_policy
=== PAUSE TestAccGlacierVault_policy
=== RUN   TestAccGlacierVault_tags
=== PAUSE TestAccGlacierVault_tags
=== RUN   TestAccGlacierVault_disappears
=== PAUSE TestAccGlacierVault_disappears
=== RUN   TestAccGlacierVault_ignoreEquivalent
=== PAUSE TestAccGlacierVault_ignoreEquivalent
=== CONT  TestAccGlacierVaultLock_basic
=== CONT  TestAccGlacierVault_policy
=== CONT  TestAccGlacierVault_disappears
=== CONT  TestAccGlacierVault_notification
=== CONT  TestAccGlacierVault_tags
=== CONT  TestAccGlacierVaultLock_ignoreEquivalentPolicy
=== CONT  TestAccGlacierVault_basic
=== CONT  TestAccGlacierVault_ignoreEquivalent
=== CONT  TestAccGlacierVaultLock_completeLock
--- PASS: TestAccGlacierVault_disappears (17.45s)
--- PASS: TestAccGlacierVault_basic (22.40s)
--- PASS: TestAccGlacierVaultLock_basic (24.51s)
--- PASS: TestAccGlacierVaultLock_completeLock (25.10s)
--- PASS: TestAccGlacierVault_ignoreEquivalent (30.38s)
--- PASS: TestAccGlacierVaultLock_ignoreEquivalentPolicy (31.58s)
--- PASS: TestAccGlacierVault_tags (51.51s)
--- PASS: TestAccGlacierVault_policy (52.37s)
--- PASS: TestAccGlacierVault_notification (55.64s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/glacier	59.565s

[github-actions]

This functionality has been released in v3.70.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.