fix: missing placeholder %s in String.format (#135)

## Description

fix: missing placeholder %s in String.format

**Related issue (if any):** fixes #issue_number_goes_here

## Checklist

- [x] I have followed this repository's contributing guidelines.
- [x] I will adhere to the project's code of conduct.

## Additional information

Signed-off-by: Chao Wang <chaowan@redhat.com>

Author: soul2zimate

src/main/java/com/redhat/exhort/providers/JavaScriptProviderFactory.java

@@ -40,7 +40,7 @@ public static Provider create(final Path manifestPath) {
     var validLockFiles = String.join(",", JS_PROVIDERS.keySet());
     throw new IllegalStateException(
         String.format(
-            "No known lock file found for %s. Supported lock files: ",
+            "No known lock file found for %s. Supported lock files: %s",
             manifestPath, validLockFiles));
   }
 }