Actions betterification. by Piotr and Filip

Author: filiplajszczak

.github/workflows/tests.yaml

@@ -1,6 +1,6 @@
 name: Tests
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   build:
@@ -14,11 +14,6 @@ jobs:
 
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
 
-    - name: Setup timezone
-      uses: zcong1993/setup-timezone@master
-      with:
-        timezone: UTC
-
     - name: Set up Python
       uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5
       with: