fix version typo in min version yaml and update min version script

Author: kostyafarber

ci/deps/actions-38-minimum_versions.yaml

@@ -57,4 +57,4 @@ dependencies:
   - zstandard=0.15.2
 
   - pip:
-    - PyQt5>=5.15.1
+    - PyQt5==5.15.1

scripts/validate_min_versions_in_sync.py

@@ -63,8 +63,8 @@ def get_versions_from_ci(content: list[str]) -> tuple[dict[str, str], dict[str,
         elif "pip" in line:
             continue
         elif seen_required and line.strip():
-            if ">" in line:
-                package, version = line.strip().split(">=")
+            if "==" in line:
+                package, version = line.strip().split("==")
 
             else:
                 package, version = line.strip().split("=")