Fix the version update for BC breaking changes

The refresh script was computing the level variable based on the kind of
changes in the changelog of the unreleased version, and was later
reinitializing the variable, losing that info.

Author: stof

.github/workflows/bin/refresh

@@ -265,7 +265,6 @@ foreach ($services as $service => $hasChange) {
             exit(1);
         }
         $parts = explode('.', $lastPackageVersion);
-        $level = 1;
         if (0 === (int) $parts[0]) {
             $level = min(2, $level + 1);
         }