postgresql@12: revision bump (perl 5.38.0)

```
brew linkage --test postgresql@11
  Missing libraries:
    unexpected (libperl.so)
```

found in:
- Homebrew#152259

relates to:
- Homebrew#145939

Signed-off-by: Rui Chen <[email protected]>

Author: chenrui333

Formula/p/[email protected]

@@ -4,6 +4,7 @@ class PostgresqlAT12 < Formula
   url "https://ftp.postgresql.org/pub/source/v12.16/postgresql-12.16.tar.bz2"
   sha256 "c5f1fff7a0f93e1ec3746417b0594290ece617b4995ed95b8d527af0ba0e38f3"
   license "PostgreSQL"
+  revision 1
 
   livecheck do
     url "https://ftp.postgresql.org/pub/source/"