Fix GH:A.

Author: maleadt

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
     name: Test Julia ${{ matrix.julia-version }}
     steps:
-      - uses: actions/checkout@4
+      - uses: actions/checkout@v4
 
       - uses: julia-actions/setup-julia@v2
         with:
@@ -42,7 +42,7 @@ jobs:
           - '1.6'
       fail-fast: false
     steps:
-      - uses: actions/checkout@4
+      - uses: actions/checkout@v4
 
       - uses: julia-actions/setup-julia@v2
         with:
@@ -54,7 +54,7 @@ jobs:
   documenter:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@4
+      - uses: actions/checkout@v4
 
       - uses: julia-actions/setup-julia@v2
       - uses: julia-actions/cache@v2