fix(acbs/utils.py): use ~dirty suffix for uncommited tree

Previously, when we used -dirty, the second dash (-) was considered the actual
delimiter for REL. If the previous package version already contained a REL
(now the first dash), then the segment between the beginning and the second
dash would be considered the VER - making the package version higher than
any comparable candidate without the -dirty suffix.

Revise -dirty as ~dirty to close this loophole.

acbs/utils.py

@@ -217,7 +217,7 @@ def generate_version_stamp(task: ACBSPackageInfo) -> str:
         )
         stamp += 'Z'
         if dirty:
-            stamp += '-dirty'
+            stamp += '~dirty'
         logging.info(f'Using version stamp: {stamp}')
         return stamp
     except subprocess.CalledProcessError as ex: