udpate GHA versions

.github/workflows/ExportPluto.yaml

@@ -21,21 +21,21 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - name: Checkout this repository
-              uses: actions/checkout@v3
+              uses: actions/checkout@v4
 
             - name: Install Julia
-              uses: julia-actions/setup-julia@v1
+              uses: julia-actions/setup-julia@v2
               with:
                   version: "1" # This will automatically pick the latest Julia version
 
             - name: Cache Julia artifacts & such
-              uses: julia-actions/cache@v1
+              uses: julia-actions/cache@v2
               with:
                 cache-registries: "true"
 
             # We set up a folder that Pluto can use to cache exported notebooks. If the notebook file did not change, then Pluto can take the exported file from cache instead of running the notebook.
             - name: Set up notebook state cache
-              uses: actions/cache@v3
+              uses: actions/cache@v4
               with:
                   path: pluto_state_cache
                   key: ${{ runner.os }}-pluto_state_cache-v2-${{ hashFiles('**/Project.toml', '**/Manifest.toml', '.github/workflows/*' ) }}-${{ hashFiles('**/*jl') }}