release: update angular version in packages.bzl (#21020)

Author: mmalerba

packages.bzl

@@ -1,7 +1,7 @@
 # Each individual package uses a placeholder for the version of Angular to ensure they're
 # all in-sync. This map is passed to each ng_package rule to stamp out the appropriate
 # version for the placeholders.
-ANGULAR_PACKAGE_VERSION = "^11.0.0-0 || ^12.0.0-0"
+ANGULAR_PACKAGE_VERSION = "^11.0.0 || ^12.0.0-0"
 MDC_PACKAGE_VERSION = "^8.0.0-canary.911014711.0"
 TSLIB_PACKAGE_VERSION = "^2.0.0"