Merge branch '13.0'

* 13.0:
  Prepare release
  Closes #1143

Author: sebastianbergmann

src/StaticAnalysis/CachingSourceAnalyser.php

@@ -109,8 +109,14 @@ private function read(string $cacheFile): AnalysisResult|false
             return false;
         }
 
+        $data = file_get_contents($cacheFile);
+
+        if ($data === false) {
+            return false;
+        }
+
         return unserialize(
-            file_get_contents($cacheFile),
+            $data,
             [
                 'allowed_classes' => [
                     AnalysisResult::class,