Fix JUnit artifact name in Dependabot exclusion

Author: ljacqu

.github/dependabot.yml

@@ -7,7 +7,7 @@ updates:
   open-pull-requests-limit: 10
   target-branch: dependencies
   ignore:
-    - dependency-name: "org.junit.jupiter:junit-jupiter-api"
+    - dependency-name: "org.junit.jupiter:junit-jupiter"
       versions: ">= 6"
 - package-ecosystem: "github-actions"
   directory: "/"