Add som to codespell exceptions

Author: cclauss

.github/workflows/codespell.yml

@@ -11,7 +11,7 @@ jobs:
       - run: pip install codespell flake8
       - run: |
           SKIP="./.*,./other/dictionary.txt,./other/words,./project_euler/problem_22/p022_names.txt"
-          codespell -L ans,fo,hist,iff,secant,tim --skip=$SKIP --quiet-level=2
+          codespell -L ans,fo,hist,iff,secant,som,tim --skip=$SKIP --quiet-level=2
       - name: Codespell comment
         if: ${{ failure() }}
         uses: plettich/python_codespell_action@master