Fix linter errors

Author: oscarsj

src/debug-artifacts.ts

@@ -312,7 +312,7 @@ export async function uploadDebugArtifacts(
 export async function getArtifactUploaderClient(
   logger: Logger,
   ghVariant: GitHubVariant,
-): Promise<artifact.ArtifactClient | artifactLegacy.ArtifactClient> {
+): Promise<artifact.ArtifactClient> {
   if (ghVariant === GitHubVariant.GHES) {
     logger.info(
       "Debug artifacts can be consumed with `actions/download-artifact@v3` because the `v4` version is not yet compatible on GHES.",
@@ -322,7 +322,8 @@ export async function getArtifactUploaderClient(
     logger.info(
       "Debug artifacts can be consumed with `actions/download-artifact@v4`.",
     );
-    return new artifact.DefaultArtifactClient();
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-call
+    return new artifact.DefaultArtifactClient() as artifact.ArtifactClient;
   }
 }