build: bump golang.org/x/tools from 0.30.0 to 0.31.0

Bumps [golang.org/x/tools](https://github.com/golang/tools) from 0.30.0 to 0.31.0.
- [Release notes](https://github.com/golang/tools/releases)
- [Commits](golang/tools@v0.30.0...v0.31.0)

---
updated-dependencies:
- dependency-name: golang.org/x/tools
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

go.mod

@@ -1,7 +1,6 @@
 module tshaka.dev/x/diff
 
 go 1.22.0
-
 toolchain go1.23.1
 
-require golang.org/x/tools v0.30.0
+require golang.org/x/tools v0.31.0

go.sum

@@ -1,2 +1,2 @@
-golang.org/x/tools v0.30.0 h1:BgcpHewrV5AUp2G9MebG4XPFI1E2W41zU1SaqVA9vJY=
-golang.org/x/tools v0.30.0/go.mod h1:c347cR/OJfw5TI+GfX7RUPNMdDRRbjvYTS0jPyvsVtY=
+golang.org/x/tools v0.31.0 h1:0EedkvKDbh+qistFTd0Bcwe/YLh4vHwWEkiI0toFIBU=
+golang.org/x/tools v0.31.0/go.mod h1:naFTU+Cev749tSJRXJlna0T3WxKvb1kWEx15xA4SdmQ=