Add a workflow to update dependencies (#490)

* Add a workflow to update dependencies

* Use '--no-docker' to run dependency update using local pythons

Default method is to use docker

* Only run the dependency update workflow manually

PR are only created for master

* Create constraints for all python versions

* Use manylinux2010_x86_64:latest to update dependencies

Co-authored-by: Joe Rickerby <joerick@mac.com>

.github/workflows/update-dependencies.yml

@@ -0,0 +1,31 @@
+name: Update dependencies
+
+on: workflow_dispatch
+
+jobs:
+  update-dependencies:
+    name: Update dependencies
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-python@v2
+      name: Install Python 3.9
+      with:
+        python-version: 3.9
+        architecture: x64
+    - name: Install dependencies
+      run: python -m pip install requests pip-tools
+    - name: Run update
+      run: python ./bin/update_dependencies.py
+    - name: Create Pull Request
+      if: github.ref == 'refs/heads/master'
+      uses: peter-evans/create-pull-request@v3
+      with:
+        commit-message: Update dependencies
+        title: '[Bot] Update dependencies'
+        body: |
+          Update the versions of our dependencies.
+
+          PR generated by "Update dependencies" [workflow](https://github.com/${{github.repository}}/actions/runs/${{github.run_id}}).
+        branch: update-dependencies-pr
+        delete-branch: true