chore(deps): update xpkg.upbound.io/upbound/provider-aws-s3 docker tag to v1.18.1

This MR contains the following updates:

Package	Type	Update	Change
xpkg.upbound.io/upbound/provider-aws-s3		minor	v1.17.0 -> v1.18.1
xpkg.upbound.io/upbound/provider-aws-s3	ironbank-docker	minor	v1.17.0 -> v1.18.1
xpkg.upbound.io/upbound/provider-aws-s3	stage	minor	v1.17.0 -> v1.18.1

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