Bump julia-actions/install-juliaup from 2 to 3 (#84)

Author: dependabot[bot]

.github/workflows/main.yml

@@ -25,7 +25,7 @@ jobs:
           submodules: recursive
 
       - name: Set up Julia
-        uses: julia-actions/install-juliaup@v2
+        uses: julia-actions/install-juliaup@v3
         with:
           channel: "lts"
 
@@ -200,7 +200,7 @@ jobs:
           submodules: recursive
 
       - name: Set up Julia
-        uses: julia-actions/install-juliaup@v2
+        uses: julia-actions/install-juliaup@v3
         with:
           channel: ${{ matrix.julia-version }}