File product.json-reproducible-date.patch of Package code

Override build date in product.json for reproducibility sake

--- vscode-1.67.0/build/gulpfile.vscode.js	2022-05-04 13:47:11.000000000 +0200
+++ vscode-1.67.0/build/gulpfile.vscode.js	2022-06-30 11:54:58.363450830 +0200
@@ -206,7 +206,7 @@
 		const packageJsonStream = gulp.src(['package.json'], { base: '.' })
 			.pipe(json(packageJsonUpdates));
 
-		const date = new Date().toISOString();
+		const date = new Date(parseInt(process.env.SOURCE_DATE_EPOCH)*1000).toISOString();
 		const productJsonUpdate = { commit, date, checksums, version };
 
 		const productJsonStream = gulp.src(['product.json'], { base: '.' })
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