ci: bump GitHub Actions versions for Node.js 20 deprecation

Bump action versions across all workflows to ensure compatibility
with the upcoming Node.js 24 default (June 2nd, 2026):

- actions/checkout v4 -> v5
- actions/setup-go v5 -> v6
- actions/upload-artifact v4 -> v5
- actions/download-artifact v4 -> v5
- golangci/golangci-lint-action v7 -> v9

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Flyrell

.github/workflows/ci.yml

@@ -8,10 +8,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version: '1.26'
 
@@ -22,14 +22,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version: '1.26'
 
       - name: Run golangci-lint
-        uses: golangci/golangci-lint-action@v7
+        uses: golangci/golangci-lint-action@v9
         with:
           version: v2.10.1

.github/workflows/deploy.yml

@@ -9,10 +9,10 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/v')
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version: '1.26'
 

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
     if: github.ref == 'refs/heads/main'
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0
 
@@ -34,7 +34,7 @@ jobs:
           echo "Next version: $NEXT_VERSION"
 
       - name: Set up Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version: '1.26'
 
@@ -60,7 +60,7 @@ jobs:
           done
 
       - name: Upload build artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: binaries
           path: dist/
@@ -75,7 +75,7 @@ jobs:
     needs: build
     steps:
       - name: Download build artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v5
         with:
           name: binaries
           path: dist/
@@ -144,7 +144,7 @@ jobs:
           done
 
       - name: Upload signed artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: binaries-signed
           path: dist/
@@ -155,12 +155,12 @@ jobs:
     needs: [build, sign-macos]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0
 
       - name: Download signed artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v5
         with:
           name: binaries-signed
           path: dist/