update actions and add PR template

.github/pull_request_template.md

@@ -0,0 +1,15 @@
+# Description
+
+Please summarise the changes.
+
+# Related issues
+
+Please mention any github issues addressed by this PR.
+
+# Checklist
+
+- [ ] I have performed a self-review of my code.
+- [ ] I have commented hard-to-understand parts of my code.
+- [ ] I have made corresponding changes to the public API documentation.
+- [ ] I have added tests that prove my fix is effective or that my feature works.
+- [ ] I have updated the changelog with any user-facing changes.

.github/workflows/build_and_test.yml

@@ -65,7 +65,7 @@ jobs:
       shell: bash
       run: |
         ./.github/workflows/build-test nomypy
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       if: github.event_name == 'release' || contains(github.ref, 'refs/heads/wheel')
       with:
         name: artefacts
@@ -87,7 +87,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
     - name: Download all wheels
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         path: wheelhouse
     - name: Put them all in the dist folder
@@ -115,7 +115,7 @@ jobs:
       with:
         python-version: '3.10'
     - name: Download all wheels
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         path: wheelhouse
     - name: Install pip, wheel

.github/workflows/docs.yml

@@ -34,7 +34,7 @@ jobs:
         cd .github/workflows/docs
         mkdir extensions
         ./build-docs -d ${GITHUB_WORKSPACE}/.github/workflows/docs/extensions
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with:
         name: pytket-extension-docs
         path: .github/workflows/docs/extensions/