Bump github.com/JohannesKaufmann/html-to-markdown in /ruledocsgen

Bumps [github.com/JohannesKaufmann/html-to-markdown](https://github.com/JohannesKaufmann/html-to-markdown) from 1.4.0 to 1.4.2.
- [Release notes](https://github.com/JohannesKaufmann/html-to-markdown/releases)
- [Commits](JohannesKaufmann/html-to-markdown@v1.4.0...v1.4.2)

---
updated-dependencies:
- dependency-name: github.com/JohannesKaufmann/html-to-markdown
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

ruledocsgen/go.mod

@@ -7,7 +7,7 @@ replace github.com/arduino/arduino-lint => ../
 replace github.com/jandelgado/gcov2lcov => github.com/jandelgado/gcov2lcov v1.0.5 // v1.0.4 causes Dependabot updates to fail due to checksum mismatch (likely a moved tag). This is an unused transitive dependency, so version is irrelevant.
 
 require (
-	github.com/JohannesKaufmann/html-to-markdown v1.4.0
+	github.com/JohannesKaufmann/html-to-markdown v1.4.2
 	github.com/arduino/arduino-lint v0.0.0
 	github.com/arduino/go-paths-helper v1.10.1
 	github.com/olekukonko/tablewriter v0.0.5
@@ -85,7 +85,7 @@ require (
 	go.opentelemetry.io/otel/trace v1.18.0 // indirect
 	golang.org/x/crypto v0.17.0 // indirect
 	golang.org/x/mod v0.8.0 // indirect
-	golang.org/x/net v0.17.0 // indirect
+	golang.org/x/net v0.18.0 // indirect
 	golang.org/x/sync v0.1.0 // indirect
 	golang.org/x/sys v0.15.0 // indirect
 	golang.org/x/text v0.14.0 // indirect