Force upgrade twine and packaging

Twine failed upload check due outdated packaging:

InvalidDistribution: Invalid distribution metadata: unrecognized or
         malformed field 'license-file'; unrecognized or malformed field
         'license-expression'

See also: pypa/twine#1245

Author: tuxu

.github/workflows/pythonpackage.yml

@@ -108,7 +108,7 @@ jobs:
         merge-multiple: true
     - name: Validate wheels
       run: |
-        pip install twine
+        pip install --upgrade twine packaging
         twine check dist/*
     - name: Publish to PyPI
       env:
@@ -128,7 +128,7 @@ jobs:
         merge-multiple: true
     - name: Validate wheels
       run: |
-        pip install twine
+        pip install --upgrade twine packaging
         twine check dist/*
     - name: Publish to PyPI Test
       env: