Update original import statements to use artifact-legacy

src/debug-artifacts.ts

@@ -1,7 +1,7 @@
 import * as fs from "fs";
 import * as path from "path";
 
-import * as artifact from "@actions/artifact";
+import * as artifactLegacy from "@actions/artifact-legacy";
 import * as core from "@actions/core";
 import AdmZip from "adm-zip";
 import del from "del";
@@ -246,7 +246,7 @@ export async function uploadDebugArtifacts(
     }
   }
 
-  await artifact.create().uploadArtifact(
+  await artifactLegacy.create().uploadArtifact(
     sanitizeArtifactName(`${artifactName}${suffix}`),
     toUpload.map((file) => path.normalize(file)),
     path.normalize(rootDir),

src/start-proxy-action-post.ts

@@ -3,7 +3,7 @@
  * It will run after the all steps in this job, in reverse order in relation to
  * other `post:` hooks.
  */
-import * as artifact from "@actions/artifact";
+import * as artifactLegacy from "@actions/artifact-legacy";
 import * as core from "@actions/core";
 
 import * as actionsUtil from "./actions-util";
@@ -32,7 +32,7 @@ async function runWrapper() {
       "Debug mode is on. Uploading proxy log as Actions debugging artifact...",
     );
     try {
-      await artifact
+      await artifactLegacy
         .create()
         .uploadArtifact(
           "proxy-log-file",