build(deps): bump golang.org/x/tools from 0.15.0 to 0.16.0 in /tools

Bumps [golang.org/x/tools](https://github.com/golang/tools) from 0.15.0 to 0.16.0.
- [Release notes](https://github.com/golang/tools/releases)
- [Commits](golang/tools@v0.15.0...v0.16.0)

---
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>

tools/go.mod

@@ -2,9 +2,6 @@ module go.abhg.dev/goldmark/mermaid/tools
 
 go 1.19
 
-require golang.org/x/tools v0.15.0
+require golang.org/x/tools v0.16.0
 
-require (
-	golang.org/x/mod v0.14.0 // indirect
-	golang.org/x/sys v0.14.0 // indirect
-)
+require golang.org/x/mod v0.14.0 // indirect

tools/go.sum

@@ -1,7 +1,5 @@
 golang.org/x/mod v0.14.0 h1:dGoOF9QVLYng8IHTm7BAyWqCqSheQ5pYWGhzW00YJr0=
 golang.org/x/mod v0.14.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
 golang.org/x/sync v0.5.0 h1:60k92dhOjHxJkrqnwsfl8KuaHbn/5dl0lUPUklKo3qE=
-golang.org/x/sys v0.14.0 h1:Vz7Qs629MkJkGyHxUlRHizWJRG2j8fbQKjELVSNhy7Q=
-golang.org/x/sys v0.14.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/tools v0.15.0 h1:zdAyfUGbYmuVokhzVmghFl2ZJh5QhcfebBgmVPFYA+8=
-golang.org/x/tools v0.15.0/go.mod h1:hpksKq4dtpQWS1uQ61JkdqWM3LscIS6Slf+VVkm+wQk=
+golang.org/x/tools v0.16.0 h1:GO788SKMRunPIBCXiQyo2AaexLstOrVhuAL5YwsckQM=
+golang.org/x/tools v0.16.0/go.mod h1:kYVVN6I1mBNoB1OX+noeBjbRk4IUEPa7JJ+TJMEooJ0=