Bump actions/download-artifact from 2 to 4.1.7 in /.github/workflows

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 2 to 4.1.7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v2...v4.1.7)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci.yml

@@ -117,7 +117,7 @@ jobs:
  key: ${{ runner.os }}-sbt-cache-v2-${{ hashFiles('**/*.sbt') }}-${{ hashFiles('project/build.properties') }}
 
  - name: Download target directories (2.12.15)
- uses: actions/download-artifact@v2
+ uses: actions/download-artifact@v4.1.7
  with:
  name: target-${{ matrix.os }}-2.12.15-${{ matrix.java }}
 
@@ -127,7 +127,7 @@ jobs:
  rm targets.tar
 
  - name: Download target directories (2.13.10)
- uses: actions/download-artifact@v2
+ uses: actions/download-artifact@v4.1.7
  with:
  name: target-${{ matrix.os }}-2.13.10-${{ matrix.java }}