Bump actions/download-artifact from 6 to 8 (#2742)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 6 to 8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v6...v8)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/regression.yml

@@ -209,7 +209,7 @@ jobs:
           entrypoint: /bin/rm
           args: -rf install install_bin.tgz src ccache ${{ matrix.config_set }}
       - name: Download All artifacts
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v8
       - name: Uncompress and Move Binaries
         run: |
           BIN_FOLDER="$PWD/install/bin"
@@ -258,7 +258,7 @@ jobs:
           entrypoint: /bin/rm
           args: -rf install install_bin.tgz src ccache ${{ matrix.config_set }}
       - name: Download All artifacts
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v8
       - name: Uncompress and Move Binaries
         run: |
           BIN_FOLDER="$PWD/install/bin"
@@ -304,7 +304,7 @@ jobs:
           entrypoint: /bin/rm
           args: -rf install install_bin.tgz src ccache ${{ matrix.config_set }}
       - name: Download All artifacts
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v8
       - name: Uncompress and Move Binaries
         run: |
           BIN_FOLDER="$PWD/install/bin"
@@ -351,7 +351,7 @@ jobs:
           entrypoint: /bin/rm
           args: -rf install install_bin.tgz src ccache ${{ matrix.config_set }}
       - name: Download All artifacts
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v8
       - name: Uncompress and Move Binaries
         run: |
           BIN_FOLDER="$PWD/install/bin"
@@ -403,17 +403,17 @@ jobs:
           entrypoint: /bin/rm
           args: -rf install install_bin.tgz src ccache ${{ matrix.config_set }}
       - name: Download Base
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v8
         with:
           name: ${{format('Base{0}', matrix.tag)}}
           path: ${{format('Base{0}', matrix.tag)}}
       - name: Download Reverse
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v8
         with:
           name: ${{format('Reverse{0}', matrix.tag)}}
           path: ${{format('Reverse{0}', matrix.tag)}}
       - name: Download Forward
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v8
         with:
           name: ${{format('Forward{0}', matrix.tag)}}
           path: ${{format('Forward{0}', matrix.tag)}}