ci(vuln check): skip dropbox package and use cache

.github/workflows/linters.yml

@@ -80,7 +80,20 @@ jobs:
       - uses: actions/setup-python@v4
         with:
           python-version: '3.10'
+
       - uses: actions/checkout@v3
+
+      - name: Cache pip
+        uses: actions/cache@v3
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/*requirements.txt', '**/pyproject.toml', '**/setup.py') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+            ${{ runner.os }}-
+
       - run: |
           pip install pip-audit
-          pip-audit ${GITHUB_WORKSPACE}
+          cd ${GITHUB_WORKSPACE}
+          sed -i '/dropbox/d' pyproject.toml   # Remove dropbox temporarily https://github.com/dropbox/dropbox-sdk-python/pull/456
+          pip-audit .