Bump docfx from 2.67.1 to 2.70.4

Bumps [docfx](https://github.com/dotnet/docfx) from 2.67.1 to 2.70.4.
- [Release notes](https://github.com/dotnet/docfx/releases)
- [Changelog](https://github.com/dotnet/docfx/blob/main/RELEASENOTE.md)
- [Commits](dotnet/docfx@v2.67.1...v2.70.4)

---
updated-dependencies:
- dependency-name: docfx
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.config/dotnet-tools.json

@@ -21,7 +21,7 @@
       ]
     },
     "docfx": {
-      "version": "2.67.1",
+      "version": "2.70.4",
       "commands": [
         "docfx"
       ]