Updated contributor list and release date for the upcoming release

Author: jonasbn

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Change Log for spellcheck-github-actions
 
-## 0.64.0, 2026-07-30, maintenance release, update not required
+## 0.64.0, 2026-07-31, maintenance release, update not required
 
 - Adopted `pip-compile` (pip-tools) for Python dependency management via PR [#380](https://github.com/rojopolis/spellcheck-github-actions/pull/380). `requirements.in` is now the source of truth for direct dependencies (`pyspelling`, `pymdown-extensions`); `requirements.txt` is generated from it rather than hand-maintained, so transitive pins can no longer silently fall out of sync the way `bracex` did in issue [#378](https://github.com/rojopolis/spellcheck-github-actions/issues/378).
 

README.md

@@ -1058,6 +1058,7 @@ Here follows a list of contributors in alphabetical order:
 - @aSemy
 - Albert Volkman, @albertvolkman
 - Andreas Kohout, @akohout-hai
+- Arkadiusz Bokowy, @arkq
 - Byron Miller, @supernovae
 - Isaac Muse, @facelessuser
 - Jonas Brømsø, @jonasbn