update actions/checkout version to main in workflow files

Author: ipitio

.github/workflows/predict.yml

@@ -24,7 +24,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@main
 
       - name: Run inference
         run: |

.github/workflows/publish.yml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@main
 
       - name: Run tests
         run: |

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@main
 
       - name: Run tests
         run: |