Update CI

Author: willtebbutt

.github/workflows/Testing.yaml

@@ -25,8 +25,8 @@ jobs:
           - os: macOS-latest
             arch: x86
     steps:
-      - uses: actions/checkout@v2
-      - uses: julia-actions/setup-julia@v1
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}