port to looseversion

tests/update.TestCase

@@ -21,7 +21,6 @@ import yaml
 import zipfile
 import textwrap
 from datetime import datetime
-from packaging.version import Version
 from pathlib import Path
 from testcommon import TmpCwd, mkdtemp
 from unittest import mock
@@ -54,6 +53,7 @@ import fdroidserver.exception
 import fdroidserver.metadata
 import fdroidserver.update
 from fdroidserver.common import CATEGORIES_CONFIG_NAME
+from fdroidserver.looseversion import LooseVersion
 
 
 DONATION_FIELDS = ('Donate', 'Liberapay', 'OpenCollective')
@@ -1041,7 +1041,7 @@ class UpdateTest(unittest.TestCase):
 
                 javac = config['jarsigner'].replace('jarsigner', 'javac')
                 v = subprocess.check_output([javac, '-version'], stderr=subprocess.STDOUT)[6:-1].decode('utf-8')
-                if Version(v) < Version('1.8.0_132'):
+                if LooseVersion(v) < LooseVersion('1.8.0_132'):
                     print('SKIPPING: running tests with old Java (' + v + ')')
                     return