build(deps): bump actions/download-artifact from 5 to 6 (#1477)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -250,7 +250,7 @@ jobs:
           SOLC_VER: ${{ matrix.solc }}
 
       - name: Download testsuite
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
          name: echidna-testsuite-${{ runner.os }}
 

.github/workflows/docker.yml

@@ -101,7 +101,7 @@ jobs:
       - build
     steps:
       - name: Download digests
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           path: ${{ runner.temp }}/digests
           pattern: digests-*

.github/workflows/release.yml

@@ -89,7 +89,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Download binaries
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           pattern: echidna-redistributable-*
           merge-multiple: true