Make non-usage of pycryptodome explicit

Co-authored-by: Matthew Peveler <[email protected]>

.github/workflows/github-ci.yaml

@@ -21,8 +21,11 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.10.3"]
-
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]
+        use-cryptodome: [""]
+        include:
+          - python-version: "3.10"
+            use-cryptodome: "false"
     steps:
     - name: Checkout Code
       uses: actions/checkout@v3
@@ -41,7 +44,7 @@ jobs:
     - name: Remove cryptodome
       run: |
         pip uninstall pycryptodome -y
-      if: matrix.python-version == '3.10.3'
+      if: matrix.use-cryptodome == false
     - name: Install PyPDF2
       run: |
         pip install .