r/neptune_cluster: support in-place update of engine_version

[anGie44]

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Closes #21378

Output from acceptance testing:

--- PASS: TestAccNeptuneCluster_updateEngineVersion (1659.73s)

--- PASS: TestAccNeptuneClusterParameterGroup_description (50.76s)
--- PASS: TestAccNeptuneClusterParameterGroup_basic (51.99s)
--- PASS: TestAccNeptuneClusterParameterGroup_generatedName (52.91s)
--- PASS: TestAccNeptuneClusterParameterGroup_namePrefix (53.21s)
--- PASS: TestAccNeptuneClusterParameterGroup_NamePrefix_parameter (67.93s)
--- PASS: TestAccNeptuneClusterParameterGroup_parameter (68.82s)
--- PASS: TestAccNeptuneClusterParameterGroup_tags (82.36s)
--- PASS: TestAccNeptuneCluster_basic (163.58s)
--- PASS: TestAccNeptuneCluster_namePrefix (134.36s)
--- PASS: TestAccNeptuneClusterEndpoint_Disappears_cluster (196.53s)
--- PASS: TestAccNeptuneCluster_kmsKey (158.87s)
--- PASS: TestAccNeptuneCluster_updateIAMRoles (177.79s)
--- PASS: TestAccNeptuneCluster_encrypted (164.08s)
--- PASS: TestAccNeptuneClusterEndpoint_tags (274.00s)
--- PASS: TestAccNeptuneCluster_takeFinalSnapshot (225.76s)
--- PASS: TestAccNeptuneClusterSnapshot_basic (289.31s)
--- PASS: TestAccNeptuneCluster_backupsUpdate (207.18s)
--- PASS: TestAccNeptuneClusterEndpoint_disappears (290.69s)
--- PASS: TestAccNeptuneCluster_iamAuth (128.90s)
--- PASS: TestAccNeptuneClusterEndpoint_basic (293.70s)
--- PASS: TestAccNeptuneCluster_copyTagsToSnapshot (295.20s)
--- PASS: TestAccNeptuneCluster_tags (246.26s)
--- PASS: TestAccNeptuneCluster_disappears (165.95s)
--- PASS: TestAccNeptuneCluster_updateCloudWatchLogsExports (234.08s)
--- PASS: TestAccNeptuneCluster_deleteProtection (231.15s)
--- PASS: TestAccNeptuneClusterInstance_namePrefix (745.17s)
--- PASS: TestAccNeptuneClusterInstance_withSubnetGroup (773.37s)
--- PASS: TestAccNeptuneClusterInstance_kmsKey (815.54s)
--- PASS: TestAccNeptuneClusterInstance_withAZ (952.68s)
--- PASS: TestAccNeptuneClusterInstance_generatedName (1714.76s)
--- PASS: TestAccNeptuneClusterInstance_basic (2030.08s)

[ewbankkit]

LGTM 🚀.

% make testacc PKG_NAME=internal/service/neptune TESTARGS='-run=TestAccNeptuneCluster_updateEngineVersion\|TestAccNeptuneCluster_basic'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/neptune/... -v -count 1 -parallel 20 -run=TestAccNeptuneCluster_updateEngineVersion\|TestAccNeptuneCluster_basic -timeout 180m
=== RUN   TestAccNeptuneCluster_basic
=== PAUSE TestAccNeptuneCluster_basic
=== RUN   TestAccNeptuneCluster_updateEngineVersion
=== PAUSE TestAccNeptuneCluster_updateEngineVersion
=== CONT  TestAccNeptuneCluster_basic
=== CONT  TestAccNeptuneCluster_updateEngineVersion
--- PASS: TestAccNeptuneCluster_basic (156.88s)
--- PASS: TestAccNeptuneCluster_updateEngineVersion (1569.82s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/neptune	1575.245s

[github-actions]

This functionality has been released in v3.66.0 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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