deps(go): bump module github.com/google/go-containerregistry to v0.20.8

[updateclibot]

deps(go): bump module github.com/google/go-containerregistry

clean: go mod tidy

ran shell command "go mod tidy"

deps(go): bump module github.com/google/go-containerregistry to v0.20.8

go.mod updated Module path "github.com/google/go-containerregistry" version from "v0.20.5" to "v0.20.8"

v0.20.5

## What's Changed
* build(deps): bump docker/docker to v28.0.0+incompatible by @luhring in https://github.com/google/go-containerregistry/pull/2071
* Migrate linter to v2 by @Subserial in https://github.com/google/go-containerregistry/pull/2096
* bump go version + bump deps by @Subserial in https://github.com/google/go-containerregistry/pull/2093
* implement TextMarshaler/JSONMarshaler more consistently by @imjasonh in https://github.com/google/go-containerregistry/pull/2097
* Update CodeQL permissions by @Subserial in https://github.com/google/go-containerregistry/pull/2103
* Update goreleaser permissions by @Subserial in https://github.com/google/go-containerregistry/pull/2104
* Update provenance action in release by @Subserial in https://github.com/google/go-containerregistry/pull/2105
* Update validator action by @Subserial in https://github.com/google/go-containerregistry/pull/2106

## New Contributors
* @luhring made their first contribution in https://github.com/google/go-containerregistry/pull/2071
* @Subserial made their first contribution in https://github.com/google/go-containerregistry/pull/2096

**Full Changelog**: https://github.com/google/go-containerregistry/compare/v0.20.3...v0.20.5

GitHub Action workflow link

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