Update Gitlab Shell version to 14.23.0

What does this MR do and why?

⚠ This MR needs gitlab-shell!765 (merged) merged and the v14.23.0 git-shell tag created.

Update Gitlab Shell version to 14.23.0:

• Update module github.com/golang-jwt/jwt/v4 to v5 gitlab-shell!759 (merged)
• Update module gopkg.in/yaml.v2 to v3 gitlab-shell!763 (merged)
• Update module gitlab.com/gitlab-org/gitaly/v15 to v16 gitlab-shell!762 (merged)
• Update logrus to v1.9.3 gitlab-shell!760 (merged)
• Update module golang.org/x/sync to v0.2.0 gitlab-shell!757 (merged)
• Update module github.com/pires/go-proxyproto to v0.7.0 gitlab-shell!752 (merged)
• Update module google.golang.org/grpc to v1.55.0 gitlab-shell!758 (merged)
• Update module github.com/prometheus/client_golang to v1.15.1 gitlab-shell!756 (merged)
• Update module github.com/otiai10/copy to v1.11.0 gitlab-shell!751 (merged)
• Make golang 1.20 the default for gitlab-shell development and CI gitlab-shell!750 (merged)
• Update module golang.org/x/crypto to v0.9.0 gitlab-shell!742 (merged)
• Update dependency golang to v1.20.4 gitlab-shell!748 (merged)
• Update module github.com/hashicorp/go-retryablehttp to v0.7.2 gitlab-shell!745 (merged)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.