Merge pull request #87 from JWCook/dependabot/github_actions/actions/…

…cache-4

Bump actions/cache from 3 to 4

.github/workflows/build.yml

@@ -34,7 +34,7 @@ jobs:
       # Cache packages per python version, and reuse until lockfile changes
       - name: Cache python packages
         id: cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: .venv
           key: venv-${{ matrix.python-version }}-${{ hashFiles('poetry.lock') }}