Merge pull request #98 from jschlyter/cryptography35

Upgrade to Cryptography 35

Author: rohe

.github/workflows/test.yml

@@ -5,7 +5,20 @@ on:
   - pull_request
 
 jobs:
+  pre_job:
+    runs-on: ubuntu-latest
+    outputs:
+      should_skip: ${{ steps.skip_check.outputs.should_skip }}
+    steps:
+      - id: skip_check
+        uses: fkirc/skip-duplicate-actions@master
+        with:
+          do_not_skip: '["pull_request"]'
+          cancel_others: 'true'
+          concurrent_skipping: same_content
   test:
+    needs: pre_job
+    if: ${{ needs.pre_job.outputs.should_skip != 'true' }}
     runs-on: ubuntu-latest
     strategy:
       matrix: