Bumped to Pants 2.21 and actions to Node 20 (#17)

.github/workflows/pants.yaml

@@ -23,8 +23,8 @@ jobs:
       matrix:
         python-version: [3.8]
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-python@v4
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
     - uses: crazy-max/ghaction-setup-docker@v3
@@ -80,7 +80,7 @@ jobs:
       run: |
         pants --docker-build-verbose package ::
     - name: Upload Pants log
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: pants-log
         path: .pants.d/pants.log

pants.toml

@@ -1,5 +1,5 @@
 [GLOBAL]
-pants_version = "2.20.0"
+pants_version = "2.21.0"
 
 backend_packages = [
   "pants.backend.docker",