fix(ci): run codecov report generation on pr against master

Author: Kirill Fuks

.github/workflows/create-coverage-report.yml

@@ -13,7 +13,7 @@ on:
       - "**"
   pull_request:
     branches:
-      - "main"
+      - "master"
     paths:
       - "src/**.php"
       - "tests/**.php"