build: bump readline-sync from 1.4.7 to 1.4.9

Bumps [readline-sync](https://github.com/anseki/readline-sync) from 1.4.7 to 1.4.9.
- [Release notes](https://github.com/anseki/readline-sync/releases)
- [Commits](anseki/readline-sync@1.4.7...1.4.9)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot-support

yarn.lock

@@ -1127,8 +1127,8 @@ readable-stream@^2.1.5:
     util-deprecate "~1.0.1"
 
 readline-sync@^1.4.7:
-  version "1.4.7"
-  resolved "https://registry.yarnpkg.com/readline-sync/-/readline-sync-1.4.7.tgz#001bfdd4c06110c3c084c63bf7c6a56022213f30"
+  version "1.4.9"
+  resolved "https://registry.yarnpkg.com/readline-sync/-/readline-sync-1.4.9.tgz#3eda8e65f23cd2a17e61301b1f0003396af5ecda"
 
 rechoir@^0.6.2:
   version "0.6.2"