Revert "temp disable unit tests"

This reverts commit 6d4d674.

Author: jorisvandenbossche

.github/workflows/unit-tests.yml

@@ -5,13 +5,13 @@ on:
     branches:
       - main
       - 2.3.x
-  # pull_request:
-  #   branches:
-  #     - main
-  #     - 2.3.x
-  #   paths-ignore:
-  #     - "doc/**"
-  #     - "web/**"
+  pull_request:
+    branches:
+      - main
+      - 2.3.x
+    paths-ignore:
+      - "doc/**"
+      - "web/**"
 
 permissions:
   contents: read