Update GitHub CI scripts (#148)

Summary:
Update GitHub helper scripts to their latest version, and consistently request Python 3.9.

Pull Request resolved: #148

Reviewed By: finik

Differential Revision: D56907464

fbshipit-source-id: f599f36907a1de5471ebedb3bf6c3c4825335e59

.github/workflows/build-and-test-pixi.yml

@@ -16,7 +16,7 @@ jobs:
         os: [macos-latest, macos-14, ubuntu-latest, windows-2019] # macos-14 is macSilicon
     steps:
       - name : Setup repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name : Remove Mono framework
         if: runner.os == 'macOS'

.github/workflows/build-and-test.yml

@@ -16,7 +16,7 @@ jobs:
       fail-fast: false
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Install dependencies
         run: |

.github/workflows/publish-website.yml

@@ -12,10 +12,10 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6]
+        python-version: [3.9]
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
     - name: Install dependencies
       run: |
         sudo apt-get update

.github/workflows/release.yml

@@ -8,10 +8,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout-repo-content
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: setup-python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
         with:
           python-version: 3.9
 
@@ -41,7 +41,7 @@ jobs:
         with:
           repository: ${{ github.repository }}
       - name: checkout-repo-content
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Create release
         if: needs.get-current-version.outputs.current_tag != steps.get-latest-tag.outputs.release