Bump fileutils from 1.7.2 to 1.7.3 in /steep

Bumps [fileutils](https://github.com/ruby/fileutils) from 1.7.2 to 1.7.3.
- [Release notes](https://github.com/ruby/fileutils/releases)
- [Commits](ruby/fileutils@v1.7.2...v1.7.3)

---
updated-dependencies:
- dependency-name: fileutils
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

steep/Gemfile.lock

@@ -23,7 +23,7 @@ GEM
     csv (3.3.0)
     drb (2.2.1)
     ffi (1.17.0)
-    fileutils (1.7.2)
+    fileutils (1.7.3)
     i18n (1.14.6)
       concurrent-ruby (~> 1.0)
     json (2.8.2)