Bump chainguard.dev/apko from 0.20.2 to 0.21.0 in the all group

Bumps the all group with 1 update: [chainguard.dev/apko](https://github.com/chainguard-dev/apko).


Updates `chainguard.dev/apko` from 0.20.2 to 0.21.0
- [Release notes](https://github.com/chainguard-dev/apko/releases)
- [Changelog](https://github.com/chainguard-dev/apko/blob/main/NEWS.md)
- [Commits](chainguard-dev/apko@v0.20.2...v0.21.0)

---
updated-dependencies:
- dependency-name: chainguard.dev/apko
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: all
...

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -3,7 +3,7 @@ module sigs.k8s.io/tejolote
 go 1.23.2
 
 require (
-	chainguard.dev/apko v0.20.2
+	chainguard.dev/apko v0.21.0
 	cloud.google.com/go/pubsub v1.45.3
 	cloud.google.com/go/storage v1.48.0
 	github.com/go-git/go-git/v5 v5.12.0

go.sum

@@ -1,7 +1,7 @@
 cel.dev/expr v0.16.2 h1:RwRhoH17VhAu9U5CMvMhH1PDVgf0tuz9FT+24AfMLfU=
 cel.dev/expr v0.16.2/go.mod h1:gXngZQMkWJoSbE8mOzehJlXQyubn/Vg0vR9/F3W7iw8=
-chainguard.dev/apko v0.20.2 h1:RcP/XxWuvwww8Ragy4Svx0P0v6WNrClzjbz+Akw3mmg=
-chainguard.dev/apko v0.20.2/go.mod h1:Dz/1cWdn6w53ZbMR2qA0tHcqhLhb2YptAWCk5r2pByw=
+chainguard.dev/apko v0.21.0 h1:McqW15qcBpV7vlAc3SBoD8Ruxjqi+rmO/4Ls1H1jLMw=
+chainguard.dev/apko v0.21.0/go.mod h1:Dz/1cWdn6w53ZbMR2qA0tHcqhLhb2YptAWCk5r2pByw=
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.116.0 h1:B3fRrSDkLRt5qSHWe40ERJvhvnQwdZiHu0bJOpldweE=
 cloud.google.com/go v0.116.0/go.mod h1:cEPSRWPzZEswwdr9BxE6ChEn01dWlTaF05LiC2Xs70U=