chore(deps): bump alpine from 3.15.4 to 3.20.0 in /aries/agents/aath-backchannel #7628

Job	Run time
workspace_clippy (vdrtools_wallet)	3m 26s
workspace_clippy (askar_wallet)	3m 25s
workflow-setup	20s
verify-code-formatting	21s
aries_vcx_clippy (credx,vdrtools_wallet)	2m 12s
aries_vcx_clippy (vdr_proxy_ledger,vdrtools_wallet)	2m 10s
workflow-setup-check	1s
test-unit-workspace	4m 6s
test-compatibility-aries-vcx-wallet	2m 33s
build-docker-vdrproxy	4s
test-integration-aries-vcx (vdrtools_wallet,credx)	8m 23s
build-docker-aath-backchannel	0s
test-integration-aries-vcx (askar_wallet,credx)	8m 35s
test-integration-aries-vcx-anoncreds-rs	6m 1s
test-integration-aries-vcx-mysql	4m 44s
test-wallet-migrator	2m 33s
test-integration-did-crate	3m 48s
publish-docker-aath-backchannel	0s
publish-docker-vdrproxy	8s
test-integration-aries-vcx-vdrproxy	13m 50s
make-release	0s
	1h 6m 40s

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