chore: fix JavaScript lint errors

PR-URL: #9305
Closes: #9301
Reviewed-by: Athan Reines <[email protected]>

Author: Dheemanth07

lib/node_modules/@stdlib/_tools/bundle/pkg-list/examples/multiple-bundles-single-scope/index.js

@@ -20,10 +20,10 @@
 
 var join = require( 'path' ).join;
 var mkdirp = require( 'mkdirp' ).sync;
-var collapse = require( 'bundle-collapser/plugin' );
+var collapse = require( 'bundle-collapser/plugin.js' );
 var uglifyify = require( 'uglifyify' );
 var uglify = require( 'uglify-js' );
-var packFlat = require( 'browser-pack-flat/plugin' );
+var packFlat = require( 'browser-pack-flat/plugin.js' );
 var pkgNames = require( '@stdlib/_tools/pkgs/names' ).sync;
 var instanceOf = require( '@stdlib/assert/instance-of' );
 var writeFile = require( '@stdlib/fs/write-file' ).sync;