Update actions

Author: lkdvos

.github/workflows/CI.yml

@@ -34,7 +34,7 @@ jobs:
           - ubuntu-latest
           - macOS-latest
           - windows-latest
-    uses: "lkdvos/SCIMLactions/.github/workflows/tests.yml@main"
+    uses: "lkdvos/SCIMLactions/.github/workflows/tests.yml@master"
     with:
       group: "${{ matrix.group }}"
       julia-version: "${{ matrix.version }}"