Bump github.com/google/yamlfmt from 0.17.2 to 0.20.0 in /hack/tools

Bumps [github.com/google/yamlfmt](https://github.com/google/yamlfmt) from 0.17.2 to 0.20.0.
- [Release notes](https://github.com/google/yamlfmt/releases)
- [Changelog](https://github.com/google/yamlfmt/blob/main/.goreleaser.yaml)
- [Commits](google/yamlfmt@v0.17.2...v0.20.0)

---
updated-dependencies:
- dependency-name: github.com/google/yamlfmt
  dependency-version: 0.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

hack/tools/go.mod

@@ -5,7 +5,7 @@ go 1.24.5
 require (
 	github.com/braydonk/yaml v0.9.0
 	github.com/golangci/golangci-lint/v2 v2.6.0
-	github.com/google/yamlfmt v0.17.2
+	github.com/google/yamlfmt v0.20.0
 	github.com/vektra/mockery/v2 v2.53.4
 	golang.org/x/tools v0.38.0
 )

hack/tools/go.sum

@@ -316,8 +316,8 @@ github.com/google/pprof v0.0.0-20200708004538-1a94d8640e99/go.mod h1:ZgVRPoUq/hf
 github.com/google/pprof v0.0.0-20250820193118-f64d9cf942d6 h1:EEHtgt9IwisQ2AZ4pIsMjahcegHh6rmhqxzIRQIyepY=
 github.com/google/pprof v0.0.0-20250820193118-f64d9cf942d6/go.mod h1:I6V7YzU0XDpsHqbsyrghnFZLO1gwK6NPTNvmetQIk9U=
 github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
-github.com/google/yamlfmt v0.17.2 h1:TkXxhmj7dnpmOnlWGOXog92Gs6MWcTZqnf3kuyp8yFQ=
-github.com/google/yamlfmt v0.17.2/go.mod h1:gs0UEklJOYkUJ+OOCG0hg9n+DzucKDPlJElTUasVNK8=
+github.com/google/yamlfmt v0.20.0 h1:EfMuMFEZGnXPn2NY+KgJTH9sNs6P+am/Of6IwE2K6P8=
+github.com/google/yamlfmt v0.20.0/go.mod h1:gs0UEklJOYkUJ+OOCG0hg9n+DzucKDPlJElTUasVNK8=
 github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
 github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
 github.com/gordonklaus/ineffassign v0.2.0 h1:Uths4KnmwxNJNzq87fwQQDDnbNb7De00VOk9Nu0TySs=