chore: update Brewfile per renaming postgresql Formula

postgresql was renamed to postgresql@14 in the Homebrew upstream
and now postgresql@16 is the latest stable, so we can use
postgresql@16 in the development environment.

cf.
Homebrew/homebrew-core@8060df9

Signed-off-by: Takuya Noguchi <[email protected]>

Author: tnir

Brewfile

@@ -3,7 +3,8 @@
 brew "ffmpeg"
 brew "memcached"
 brew "mysql"
-brew "postgresql"
+brew "postgresql@16"
+brew "libpq"
 brew "redis"
 brew "yarn"
 cask "xquartz"