Update .github/CONTRIBUTING.md

Co-authored-by: Christoph M. Becker <[email protected]>

Author: localheinz

.github/CONTRIBUTING.md

@@ -121,11 +121,6 @@ Having said that, here are the organizational rules:
    php tests/run-tests.php -q --show-diff`.
    ```
 
-Currently we have the following branches in use:
-
-| Branch    |           |
-| --------- | --------- |
-| master    | Active development branch for PHP 8.2 |
 
 The next few rules are more of a technical nature: