workflow: bump all actions

actions/checkout@v1 -> v4
actions/upload-artifact@v2 -> v4
actions/download-artifact@v2 -> v4

.github/workflows/main.yml

@@ -26,7 +26,7 @@ jobs:
       commit_message: ${{ steps.build.outputs.commit_message }}
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v1
+        uses: actions/checkout@v4
       - name: Install tools
         run: |
           sudo apt-get update
@@ -54,7 +54,7 @@ jobs:
           echo ::set-output name=commit_subject::$(git log -1 "$GITHUB_SHA" --pretty="%s")
           echo ::set-output name=commit_message::$(git log -1 "$GITHUB_SHA" --pretty="%b")
       - name: Publish build to GH Actions
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           path: ~/artifacts/*
           name: build
@@ -74,7 +74,7 @@ jobs:
       current_date: ${{ steps.commit.outputs.current_date }}
     steps:
       - name: Download artifacts
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4
         with:
           name: build
           path: build