ci: install flask through apt

Author: natesales

.github/workflows/test.yml

@@ -23,8 +23,7 @@ jobs:
 
       - name: Install pre-commit deps
         run: |
-          sudo apt install -y pre-commit
-          pip install flask
+          sudo apt install -y pre-commit python3-flask
           go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest
           go install golang.org/x/tools/cmd/goimports@latest
           go install github.com/fzipp/gocyclo/cmd/gocyclo@latest