Update (ci): github action's artifact upgrade due to EOL for versions less than 4

Author: alleeclark

.github/workflows/_build-packages.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Keep artifact
         id: keep-artifact
         run: python -c "print('DAYS=' + str(5 if '${{ github.event_name }}'.startswith('pull_request') else 0))" >> $GITHUB_OUTPUT
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: ${{ inputs.artifact-name }}
           path: dist
@@ -44,10 +44,11 @@ jobs:
         pkg-name: ${{ fromJSON(inputs.pkg-names) }}
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: ${{ inputs.artifact-name }}
           path: pypi
+          merge-multiple: true
       - uses: actions/setup-python@v5
         with:
           python-version: 3.9
@@ -63,7 +64,7 @@ jobs:
           mkdir pypi/${{ matrix.pkg-name }}
           cp dist/* pypi/${{ matrix.pkg-name }}/
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: ${{ inputs.artifact-name }}
           path: pypi

.github/workflows/_legacy-checkpoints.yml

@@ -104,7 +104,7 @@ jobs:
           python -c "print('AWS_RUN=' + str('' if '${{inputs.push_to_s3}}' == 'true' else '--dryrun'))" >> $GITHUB_ENV
 
       - name: Upload checkpoints to GitHub Actions artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: checkpoints-${{ github.sha }}
           path: ${{ env.LEGACY_FOLDER }}/checkpoints/

.github/workflows/ci-pkg-install.yml

@@ -50,10 +50,11 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: dist-packages-${{ github.sha }}
           path: dist
+          merge-multiple: true
 
       - name: Set package dir
         run: |

.github/workflows/docs-build.yml

@@ -129,7 +129,7 @@ jobs:
         run: echo "ARTIFACT_DAYS=7" >> $GITHUB_ENV
       - name: Upload built docs
         if: ${{ matrix.target == 'html' }}
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: docs-${{ matrix.pkg-name }}-${{ github.sha }}
           path: docs/build/html/
@@ -158,10 +158,11 @@ jobs:
       # use input if dispatch or git tag
       VERSION: ${{ inputs.version || github.ref_name }}
     steps:
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: docs-${{ matrix.pkg-name }}-${{ github.sha }}
           path: docs/build/html/
+          merge-multiple: true
 
       - name: Authenticate to Google Cloud
         uses: google-github-actions/auth@v2

.github/workflows/release-pkg.yml

@@ -38,10 +38,11 @@ jobs:
     if: github.event_name == 'release'
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: dist-packages-${{ github.sha }}
           path: dist
+          merge-multiple: true
       - run: ls -lh dist/
       - name: Upload to release
         uses: AButler/[email protected]
@@ -140,10 +141,11 @@ jobs:
         name: ["FABRIC", "PYTORCH", "LIGHTNING"]
     steps:
       - uses: actions/checkout@v4 # needed for local action below
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: dist-packages-${{ github.sha }}
           path: dist
+          merge-multiple: true
       - name: Browse folder
         id: folder
         run: |
@@ -165,10 +167,11 @@ jobs:
         name: ["FABRIC", "PYTORCH", "LIGHTNING"]
     steps:
       - uses: actions/checkout@v4 # needed for local action below
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: dist-packages-${{ github.sha }}
           path: dist
+          merge-multiple: true
       - name: Browse folder
         id: folder
         run: |