Simulate level 10 in issue bot on 1.12.x

Author: ondrejmirtes

.github/workflows/issue-bot.yml

@@ -106,6 +106,9 @@ jobs:
           attempt_limit: 5
           attempt_delay: 1000
 
+      - name: "Add level 10 config file"
+        run: "cp issue-bot/config.level10.neon conf/"
+
       - name: "Run PHPStan"
         working-directory: "issue-bot"
         timeout-minutes: 5

issue-bot/config.level10.neon

@@ -0,0 +1,5 @@
+includes:
+	- config.level9.neon
+
+parameters:
+	checkImplicitMixed: true