Prover: fix credx credential retrieval #5786

Job	Run time
workflow-setup	25s
clippy-aries-vcx	4m 34s
check-did-resolver-feature-variants	2m 38s
verify-code-formatting	19s
check-aries-vcx-feature-variants	5m 31s
workflow-setup-check	1s
code-coverage-aries-vcx-integration-modular-libs	27m 2s
test-unit-workspace (anoncreds_vdrtools)	3m 9s
test-unit-workspace (anoncreds_credx)	3m 22s
build-docker-vdrproxy	8s
test-integration-aries-vcx (vdrtools)	26m 16s
test-integration-aries-vcx (modular_libs)	25m 36s
test-integration-aries-vcx-migration	20m 43s
test-integration-aries-vcx-mysql	4m 33s
test-integration-libvcx (anoncreds_vdrtools)	5m 14s
test-integration-libvcx (anoncreds_credx)	4m 31s
test-integration-node-wrapper (18.x)	8m 56s
test-integration-resolver	4m 9s
test-node-wrapper (18.x)	3m 9s
x86_64-unknown-linux-gnu	5m 38s
x86_64-unknown-linux-musl	10m 38s
x86_64-apple-darwin	12m 38s
aarch64-apple-darwin	27m 19s
test-integration-aries-vcx-vdrproxy	25m 35s
publish-docker-vdrproxy	12s
make-release	0s
publish-napi	49s
publish-node-wrapper	27s
publish-agent-core	1m 11s
	3h 54m 43s

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