build(deps): bump k8s.io/code-generator from 0.29.2 to 0.31.2 in /tools

Bumps [k8s.io/code-generator](https://github.com/kubernetes/code-generator) from 0.29.2 to 0.31.2.
- [Commits](kubernetes/code-generator@v0.29.2...v0.31.2)

---
updated-dependencies:
- dependency-name: k8s.io/code-generator
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

tools/go.mod

@@ -11,7 +11,7 @@ require (
 	github.com/google/ko v0.17.1
 	github.com/goreleaser/goreleaser/v2 v2.4.4
 	gotest.tools/gotestsum v1.12.0
-	k8s.io/code-generator v0.29.2
+	k8s.io/code-generator v0.31.2
 	knative.dev/pkg v0.0.0-20240222182851-7594067e0eac
 	mvdan.cc/gofumpt v0.7.0
 )

tools/go.sum

@@ -1467,8 +1467,8 @@ honnef.co/go/tools v0.5.1 h1:4bH5o3b5ZULQ4UrBmP+63W9r7qIkqJClEA9ko5YKx+I=
 honnef.co/go/tools v0.5.1/go.mod h1:e9irvo83WDG9/irijV44wr3tbhcFeRnfpVlRqVwpzMs=
 k8s.io/apimachinery v0.31.2 h1:i4vUt2hPK56W6mlT7Ry+AO8eEsyxMD1U44NR22CLTYw=
 k8s.io/apimachinery v0.31.2/go.mod h1:rsPdaZJfTfLsNJSQzNHQvYoTmxhoOEofxtOsF3rtsMo=
-k8s.io/code-generator v0.29.2 h1:c9/iw2KnNpw2IRV+wwuG/Wns2TjPSgjWzbbjTevyiHI=
-k8s.io/code-generator v0.29.2/go.mod h1:FwFi3C9jCrmbPjekhaCYcYG1n07CYiW1+PAPCockaos=
+k8s.io/code-generator v0.31.2 h1:xLWxG0HEpMSHfcM//3u3Ro2Hmc6AyyLINQS//Z2GEOI=
+k8s.io/code-generator v0.31.2/go.mod h1:eEQHXgBU/m7LDaToDoiz3t97dUUVyOblQdwOr8rivqc=
 k8s.io/gengo v0.0.0-20240129211411-f967bbeff4b4 h1:izq7u3SJBdOAuA5YYe1/PIp9jczrih/jGlKRRt0G7bQ=
 k8s.io/gengo v0.0.0-20240129211411-f967bbeff4b4/go.mod h1:FiNAH4ZV3gBg2Kwh89tzAEV2be7d5xI0vBa/VySYy3E=
 k8s.io/gengo/v2 v2.0.0-20240228010128-51d4e06bde70 h1:NGrVE502P0s0/1hudf8zjgwki1X/TByhmAoILTarmzo=