fix: tolerate Browserslist data-age warning in build script

scripts/build.js treats any babel stderr output (other than Node/babel
deprecation warnings) as a build failure. When caniuse-lite ages past
~6 months, Browserslist prints a "browsers data is N months old" notice
to stderr, which fails `yarn build:stable` in CI for reasons unrelated to
the actual change.

Add `Browserslist` to the ignore pattern so this informational notice is
not treated as a failure. The companion caniuse-lite refresh fixes the
current instance; this prevents the build from breaking again as the data
ages.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: dianaKhortiuk-frontegg

scripts/build.js

@@ -77,8 +77,9 @@ async function run(argv) {
 
   try {
     const { stderr, stdout } = await exec(command, { env: { ...process.env, ...env } });
-    // Don't treat Node/babel deprecation warnings on stderr as failure
-    if (stderr && !/DeprecationWarning|url\.parse/.test(stderr)) {
+    // Don't treat Node/babel deprecation warnings or Browserslist data-age
+    // notices (e.g. "caniuse-lite is N months old") on stderr as failure
+    if (stderr && !/DeprecationWarning|url\.parse|Browserslist/.test(stderr)) {
       throw new Error(`'${command}' failed with \n${stderr}`);
     }
     if (verbose) {