github: Use latest versions of checkout and upload-artifact actions

Author: keirf

.github/workflows/ci.yml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
 
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Set environment variables
       id: vars
@@ -43,7 +43,7 @@ jobs:
         mv flashfloppy-$VER.zip _cidist/
 
     - name: Upload artifacts
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: FlashFloppy.CI.${{ steps.vars.outputs.sha_short }}
         path: _cidist

.github/workflows/release.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
 
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Set environment variables
       id: vars