Regenerate GitHub Actions workflow

Executed command: sbt githubWorkflowGenerate

Author: scala-steward

.github/workflows/ci.yml

@@ -100,12 +100,12 @@ jobs:
             ~/Library/Caches/Coursier/v1
           key: ${{ runner.os }}-sbt-cache-v2-${{ hashFiles('**/*.sbt') }}-${{ hashFiles('project/build.properties') }}
 
-      - name: Download target directories (2.12.17)
+      - name: Download target directories (2.12.18)
         uses: actions/download-artifact@v2
         with:
-          name: target-${{ matrix.os }}-2.12.17-${{ matrix.java }}
+          name: target-${{ matrix.os }}-2.12.18-${{ matrix.java }}
 
-      - name: Inflate target directories (2.12.17)
+      - name: Inflate target directories (2.12.18)
         run: |
           tar xf targets.tar
           rm targets.tar