chore: bump default GitHub Actions to latest major versions

Author: zezke

src/pipeline.ts

@@ -779,7 +779,7 @@ export class GitHubWorkflow extends PipelineBase {
 
     for (const input of step.inputs) {
       downloadInputs.push({
-        uses: 'actions/download-artifact@v4',
+        uses: 'actions/download-artifact@v8',
         with: {
           name: input.fileSet.id,
           path: input.directory,
@@ -789,7 +789,7 @@ export class GitHubWorkflow extends PipelineBase {
 
     for (const output of step.outputs) {
       uploadOutputs.push({
-        uses: 'actions/upload-artifact@v4',
+        uses: 'actions/upload-artifact@v7',
         with: {
           name: output.fileSet.id,
           path: output.directory,
@@ -892,7 +892,7 @@ export class GitHubWorkflow extends PipelineBase {
 
     return [{
       name: `Download ${CDKOUT_ARTIFACT}`,
-      uses: 'actions/download-artifact@v4',
+      uses: 'actions/download-artifact@v8',
       with: {
         name: CDKOUT_ARTIFACT,
         path: targetDir,
@@ -904,7 +904,7 @@ export class GitHubWorkflow extends PipelineBase {
     return [
       {
         name: 'Checkout',
-        uses: 'actions/checkout@v4',
+        uses: 'actions/checkout@v6',
       },
     ];
   }
@@ -916,7 +916,7 @@ export class GitHubWorkflow extends PipelineBase {
 
     return [{
       name: `Upload ${CDKOUT_ARTIFACT}`,
-      uses: 'actions/upload-artifact@v4',
+      uses: 'actions/upload-artifact@v7',
       with: {
         name: CDKOUT_ARTIFACT,
         path: dir,