build: bump golang.org/x/tools from 0.47.0 to 0.50.0

Bumps [golang.org/x/tools](https://github.com/golang/tools) from 0.47.0 to 0.50.0.
- [Release notes](https://github.com/golang/tools/releases)
- [Commits](golang/tools@v0.47.0...v0.50.0)

---
updated-dependencies:
- dependency-name: golang.org/x/tools
  dependency-version: 0.50.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

go.mod

@@ -1,5 +1,5 @@
 module tshaka.dev/diff
 
-go 1.25.0
+go 1.26.0
 
-require golang.org/x/tools v0.47.0
+require golang.org/x/tools v0.50.0

go.sum

@@ -1,2 +1,2 @@
-golang.org/x/tools v0.47.0 h1:7Kn5x/d1svx/PzryTsqeoZN4TZwqeH5pGWjefhLi/1Q=
-golang.org/x/tools v0.47.0/go.mod h1:dFHnyTvFWY212G+h7ZY4Vsp/K3U4/7W9TyVaAul8uCA=
+golang.org/x/tools v0.50.0 h1:c2ifzfcuY7L90lZ2aKd8S4K2NpASF08SZx9ZuJkHmSU=
+golang.org/x/tools v0.50.0/go.mod h1:7ulVMw3831Mwi5EZD6RomGyffr4VFjuNYXf2BbCEAV0=