Fixed date-string parsing in build-combined script

Author: Brian Vaughn

scripts/rollup/build-all-release-channels.js

@@ -4,7 +4,7 @@
 
 const fs = require('fs');
 const fse = require('fs-extra');
-const {execSync, spawnSync} = require('child_process');
+const {spawnSync} = require('child_process');
 const path = require('path');
 const tmp = require('tmp');
 
@@ -22,10 +22,15 @@ const sha = (
   spawnSync('git', ['show', '-s', '--format=%h']).stdout + ''
 ).trim();
 
-const {stdout} = execSync(
-  `git show -s --format=%cd --date=format:'%Y%m%d' ${sha}`
-);
-const dateString = stdout.trim();
+const dateString = (
+  spawnSync('git', [
+    'show',
+    '-s',
+    '--format=%cd',
+    "--date=format:'%Y%m%d'",
+    sha,
+  ]).stdout + ''
+).trim();
 
 if (process.env.CIRCLE_NODE_TOTAL) {
   // In CI, we use multiple concurrent processes. Allocate half the processes to