Release v0.27.2

What's Changed

• Drop cosign dep by @jonjohnsonjr in #1645
• Use maps and slices from stdlib by @jonjohnsonjr in #1646
• auth: Add oauth2.TokenSource auth provider by @wlynch in #1651
• usrmerge: apko needs to create apk dirs in /usr/lib instead of /lib by @zmarano in #1593
• Make apko hermetic again. by @sfc-gh-ptabor in #1654

New Contributors

• @zmarano made their first contribution in #1593

Full Changelog: v0.27.1...v0.27.2