Bump github.com/aws/aws-sdk-go-v2/credentials from 1.16.13 to 1.16.15 #1325

Job	Run time
test	1m 16s
docker (DOCKERHUB_USERNAME, DOCKERHUB_TOKEN, zmazay/s3sync-service)	1m 9s
build (darwin, amd64)	53s
docker (quay.io, QUAY_USERNAME, QUAY_TOKEN, quay.io/s3sync-service/s3sync-service)	2m 56s
build (darwin, arm64)	53s
docker (ghcr.io, GHCR_REGISTRY_USERNAME, GITHUB_TOKEN, ghcr.io/mazay/s3sync-service)	1m 8s
build (windows, amd64)	56s
build (windows, 386)	52s
build (windows, arm)	52s
build (windows, arm64)	52s
build (linux, amd64)	55s
build (linux, 386)	51s
build (linux, arm)	57s
build (linux, arm64)	56s
build (freebsd, amd64)	57s
build (freebsd, 386)	55s
build (freebsd, arm)	56s
build (freebsd, arm64)	56s
publish	0s
helm-release	0s
	19m 10s

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