Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/geehy-apm32f103.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
 
       - name: ⬇️ checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: ⬇️ set up qemu
         uses: docker/setup-qemu-action@v2

.github/workflows/rt_thread-rt_smart.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
 
       - name: ⬇️ checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: ⬇️ set up qemu
         uses: docker/setup-qemu-action@v2

.github/workflows/ubuntu_ci-16.04.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
 
       - name: ⬇️ checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: ⬇️ set up qemu
         uses: docker/setup-qemu-action@v2

.github/workflows/ubuntu_ci-18.04.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
 
       - name: ⬇️ checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: ⬇️ set up qemu
         uses: docker/setup-qemu-action@v2

.github/workflows/ubuntu_ci-20.04.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
 
       - name: ⬇️ checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: ⬇️ set up qemu
         uses: docker/setup-qemu-action@v2

.github/workflows/ubuntu_ci-22.04.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
 
       - name: ⬇️ checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: ⬇️ set up qemu
         uses: docker/setup-qemu-action@v2