build: bump golang.org/x/tools from 0.37.0 to 0.38.0

Bumps [golang.org/x/tools](https://github.com/golang/tools) from 0.37.0 to 0.38.0.
- [Release notes](https://github.com/golang/tools/releases)
- [Commits](golang/tools@v0.37.0...v0.38.0)

---
updated-dependencies:
- dependency-name: golang.org/x/tools
  dependency-version: 0.38.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

go.mod

@@ -2,4 +2,4 @@ module tshaka.dev/diff
 
 go 1.24.0
 
-require golang.org/x/tools v0.37.0
+require golang.org/x/tools v0.38.0

go.sum

@@ -1,2 +1,2 @@
-golang.org/x/tools v0.37.0 h1:DVSRzp7FwePZW356yEAChSdNcQo6Nsp+fex1SUW09lE=
-golang.org/x/tools v0.37.0/go.mod h1:MBN5QPQtLMHVdvsbtarmTNukZDdgwdwlO5qGacAzF0w=
+golang.org/x/tools v0.38.0 h1:Hx2Xv8hISq8Lm16jvBZ2VQf+RLmbd7wVUsALibYI/IQ=
+golang.org/x/tools v0.38.0/go.mod h1:yEsQ/d/YK8cjh0L6rZlY8tgtlKiBNTL14pGDJPJpYQs=