Bump terser from 4.3.8 to 4.3.9 (#29535)

Bumps [terser](https://github.com/terser/terser) from 4.3.8 to 4.3.9.
- [Release notes](https://github.com/terser/terser/releases)
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/terser/terser/compare/v4.3.8...v4.3.9)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package-lock.json

@@ -11703,9 +11703,9 @@
       }
     },
     "terser": {
-      "version": "4.3.8",
-      "resolved": "https://registry.npmjs.org/terser/-/terser-4.3.8.tgz",
-      "integrity": "sha512-otmIRlRVmLChAWsnSFNO0Bfk6YySuBp6G9qrHiJwlLDd4mxe2ta4sjI7TzIR+W1nBMjilzrMcPOz9pSusgx3hQ==",
+      "version": "4.3.9",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-4.3.9.tgz",
+      "integrity": "sha512-NFGMpHjlzmyOtPL+fDw3G7+6Ueh/sz4mkaUYa4lJCxOPTNzd0Uj0aZJOmsDYoSQyfuVoWDMSWTPU3huyOm2zdA==",
       "dev": true,
       "requires": {
         "commander": "^2.20.0",