updating actions/checkout in workflows

.github/workflows/entrypoint_nightly.yml

@@ -21,7 +21,7 @@ jobs:
       id-token: write
     needs: test
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@main
         with:
           submodules: true
       - name: Set up Python

.github/workflows/entrypoint_prerelease.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     if: github.event.pull_request.draft == false
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@main
         with:
           submodules: false
       - name: Set up Python
@@ -47,7 +47,7 @@ jobs:
     if: github.event.pull_request.draft == false
     needs: code_test
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@main
         with:
           submodules: true
       - name: Set up Python

.github/workflows/entrypoint_pull_request.yml

@@ -37,7 +37,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: test
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@main
         with:
           submodules: true
       - name: Set up Python

.github/workflows/entrypoint_release.yml

@@ -19,7 +19,7 @@ jobs:
       id-token: write
     needs: test
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@main
         with:
           submodules: true
       - name: Set up Python

.github/workflows/sub_testing.yml

@@ -8,7 +8,7 @@ jobs:
     name: Code testing
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@main
         with:
           submodules: false
       - name: Set up Python
@@ -34,7 +34,7 @@ jobs:
         version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
         os: [win32, linux, darwin]
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@main
         with:
           submodules: false
       - name: Set up Python