Unit tests: Don’t try to sign commits with GPG

Improves performance when the global config sets this option to `true` by default

tests/Versions/TestCase.php

@@ -65,6 +65,7 @@ public function setUp(): void
 
 		$this->plugin = new Plugin($this->kirby);
 		$this->plugin->gitCommand(null, 'init', '-b', 'main');
+		$this->plugin->gitCommand(null, 'config', 'commit.gpgsign', 'false');
 		$this->plugin->gitCommand(null, 'add', '-A');
 		$this->plugin->gitCommand(null, '-c', 'user.name=Test', '-c', '[email protected]', 'commit', '-m', 'Initial commit');
 		$this->plugin->gitCommand(null, 'tag', 'initial');