build(deps): Bump golang.org/x/tools to v0.34.0 for Go 1.25 compatibility

[stefanb]

👋 Build with Go 1.25 fails with:

  ...
  go generate -tags '' ./libflux/go/libflux
  env GO111MODULE=on go build -tags '' ./...
  go: downloading github.com/dave/jennifer v1.2.0
  go: downloading golang.org/x/mod v0.18.0
  # golang.org/x/tools/internal/tokeninternal
  /Users/brew/Library/Caches/Homebrew/go_mod_cache/pkg/mod/golang.org/x/tools@v0.22.0/internal/tokeninternal/tokeninternal.go:64:9: invalid array length -delta * delta (constant -256 of type int64)
  make: *** [build] Error 1

Bumped via:

go1.25rc1 get -u golang.org/x/tools
go: upgraded golang.org/x/crypto v0.36.0 => v0.39.0
go: upgraded golang.org/x/mod v0.24.0 => v0.25.0
go: upgraded golang.org/x/net v0.38.0 => v0.41.0
go: upgraded golang.org/x/sync v0.12.0 => v0.15.0
go: upgraded golang.org/x/sys v0.31.0 => v0.33.0
go: upgraded golang.org/x/term v0.30.0 => v0.32.0
go: upgraded golang.org/x/text v0.23.0 => v0.26.0
go: upgraded golang.org/x/tools v0.30.0 => v0.34.0

go1.25rc1 mod tidy

Related:

• Go proposal: go/token: add (*FileSet).AddExistingFiles method to add files out of order golang/go#73205
• Upstream golang.org/x/tools fix: https://go-review.googlesource.com/c/tools/+/675955 / golang/tools@2815c8b
• Problem found in go 1.25.0, go@1.24 1.24.6 (new formula) Homebrew/homebrew-core#226636

Checklist

Dear Author 👋, the following checks should be completed (or explicitly dismissed) before merging.

• ✏️ Write a PR description, regardless of triviality, to include the value of this PR
• 🔗 Reference related issues
• 🏃 Test cases are included to exercise the new code
• 🧪 If new packages are being introduced to stdlib, link to Working Group discussion notes and ensure it lands under experimental/
• 📖 If language features are changing, ensure docs/Spec.md has been updated

Dear Reviewer(s) 👋, you are responsible (among others) for ensuring the completeness and quality of the above before approval.

[mhilton]

Thankyou @stefanb

[stefanb]

Please don't forget to make a release sometime before or right after go 1.25 release.