build(deps): bump mvdan.cc/gofumpt from 0.5.0 to 0.6.0 in /tools

Bumps [mvdan.cc/gofumpt](https://github.com/mvdan/gofumpt) from 0.5.0 to 0.6.0.
- [Release notes](https://github.com/mvdan/gofumpt/releases)
- [Changelog](https://github.com/mvdan/gofumpt/blob/master/CHANGELOG.md)
- [Commits](mvdan/gofumpt@v0.5.0...v0.6.0)

---
updated-dependencies:
- dependency-name: mvdan.cc/gofumpt
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

tools/go.mod

@@ -11,7 +11,7 @@ require (
 	gotest.tools/gotestsum v1.11.0
 	k8s.io/code-generator v0.29.2
 	knative.dev/pkg v0.0.0-20240222182851-7594067e0eac
-	mvdan.cc/gofumpt v0.5.0
+	mvdan.cc/gofumpt v0.6.0
 )
 
 require (

tools/go.sum

@@ -1638,8 +1638,8 @@ k8s.io/utils v0.0.0-20240102154912-e7106e64919e h1:eQ/4ljkx21sObifjzXwlPKpdGLrCf
 k8s.io/utils v0.0.0-20240102154912-e7106e64919e/go.mod h1:OLgZIPagt7ERELqWJFomSt595RzquPNLL48iOWgYOg0=
 knative.dev/pkg v0.0.0-20240222182851-7594067e0eac h1:YCcILEB2e7ve99eEYyIiF6wYwQAnYWTZ/ukn3CoOvus=
 knative.dev/pkg v0.0.0-20240222182851-7594067e0eac/go.mod h1:ShEiTxuj4Dxg5pz7A0eNRdiyurQHImirTUP9trki6Xo=
-mvdan.cc/gofumpt v0.5.0 h1:0EQ+Z56k8tXjj/6TQD25BFNKQXpCvT0rnansIc7Ug5E=
-mvdan.cc/gofumpt v0.5.0/go.mod h1:HBeVDtMKRZpXyxFciAirzdKklDlGu8aAy1wEbH5Y9js=
+mvdan.cc/gofumpt v0.6.0 h1:G3QvahNDmpD+Aek/bNOLrFR2XC6ZAdo62dZu65gmwGo=
+mvdan.cc/gofumpt v0.6.0/go.mod h1:4L0wf+kgIPZtcCWXynNS2e6bhmj73umwnuXSZarixzA=
 mvdan.cc/interfacer v0.0.0-20180901003855-c20040233aed h1:WX1yoOaKQfddO/mLzdV4wptyWgoH/6hwLs7QHTixo0I=
 mvdan.cc/interfacer v0.0.0-20180901003855-c20040233aed/go.mod h1:Xkxe497xwlCKkIaQYRfC7CSLworTXY9RMqwhhCm+8Nc=
 mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b h1:DxJ5nJdkhDlLok9K6qO+5290kphDJbHOQO1DFFFTeBo=