Adjust MSRV, fix VDR Proxy Build #7898

Job	Run time
verify-code-formatting	20s
clippy	3m 38s
workflow-setup	27s
workflow-setup-check	1s
test-unit-workspace	1m 59s
test-integration-aries-vcx (askar_wallet,anoncreds)	6m 16s
build-docker-aath-backchannel	0s
build-docker-vdrproxy	10s
test-integration-aries-vcx-ledger	1m 30s
test-integration-did-crate	1m 54s
publish-docker-aath-backchannel	0s
test-integration-aries-vcx-vdrproxy	11m 21s
publish-docker-vdrproxy	2s
make-release	0s
	27m 38s

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