use x/tools version from go.mod in go:generate

Otherwise we have to update that `@semver` string
alongside the regular x/tools updates in go.mod.
There's no reason to separate the two versions either.

main.go

@@ -1563,7 +1563,7 @@ func computePkgCache(fsCache *cache.Cache, lpkg *listedPackage, pkg *types.Packa
 // cmd/bundle will include a go:generate directive in its output by default.
 // Ours specifies a version and doesn't assume bundle is in $PATH, so drop it.
 
-//go:generate go run golang.org/x/tools/cmd/bundle@v0.5.0 -o cmdgo_quoted.go -prefix cmdgoQuoted cmd/internal/quoted
+//go:generate go run golang.org/x/tools/cmd/bundle -o cmdgo_quoted.go -prefix cmdgoQuoted cmd/internal/quoted
 //go:generate sed -i /go:generate/d cmdgo_quoted.go
 
 // computeLinkerVariableStrings iterates over the -ldflags arguments,