Updating action versions

.github/workflows/ci.yaml

@@ -21,7 +21,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
     # Check out the repository under $GITHUB_WORKSPACE
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     # Install and set up R
     - uses: r-lib/actions/setup-r@v2
@@ -57,7 +57,7 @@ jobs:
     # Upload the check directory as an artefact on failure
     - name: Upload check results
       if: failure()
-      uses: actions/upload-artifact@v1.0.0
+      uses: actions/upload-artifact@v3
       with:
         name: ${{ matrix.os }}-results
         path: Rcheck
@@ -75,7 +75,7 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Compile standalone programs
       run: cd standalone && make