[master] pmb.helpers: Handle workdir version suffix from 2.3.x

For the gitlab.com -> gitlab.postmarketos.org migration we needed to also migrate the workdir in pmb v2 since pmb v3 is not ready yet.

Therefore we need to handle that "7-2.x" workdir version and migrate correctly when switching to pmbootstrap v3.

See !2445 (merged)

pmb/helpers/other.py

@@ -88,10 +88,10 @@ def migrate_work_folder():
         with open(path) as f:
             # pmb 2.3.x added a suffix due to conflicting work versions
             # We need to be able to handle that going forward
-            version_str = f.read().rstrip().split("-")
-            current = int(version_str[0])
-            if len(version_str) == 2:
-                suffix = version_str[1]
+            version_parts = f.read().rstrip().split("-")
+            current = int(version_parts[0])
+            if len(version_parts) == 2:
+                suffix = version_parts[1]
 
     # Compare version, print warning or do nothing
     required = pmb.config.work_version