Fix the repository URL in the package.json file for pdfjs-dist

For provenance, enabled in PR #18352, to work the repository URL in
`package.json` is required to match the repository URL of the GitHub
Actions invocation. This should fix the following error we encountered
publishing a new release today:

```
npm error 422 Unprocessable Entity - PUT https://registry.npmjs.org/pdfjs-dist - Error verifying sigstore provenance bundle: Failed to validate repository information: package.json: "repository.url" is "git+https://github.com/mozilla/pdfjs-dist.git", expected to match "https://github.com/mozilla/pdf.js" from provenance
```

gulpfile.mjs

@@ -2226,7 +2226,7 @@ function packageJson() {
     },
     repository: {
       type: "git",
-      url: `git+${DIST_REPO_URL}.git`,
+      url: `git+https://github.com/mozilla/pdf.js.git`,
     },
     engines: {
       node: ">=18",