Bump rexml from 3.3.9 to 3.4.2 in /postgres

Bumps [rexml](https://github.com/ruby/rexml) from 3.3.9 to 3.4.2.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.3.9...v3.4.2)

---
updated-dependencies:
- dependency-name: rexml
  dependency-version: 3.4.2
  dependency-type: indirect
...

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

Author: dependabot[bot]

postgres/Gemfile.lock

@@ -3,6 +3,7 @@ PATH
   specs:
     testcontainers-core (0.2.0)
       docker-api (~> 2.2)
+      java-properties (~> 0.3.0)
 
 PATH
   remote: .
@@ -18,6 +19,7 @@ GEM
       excon (>= 0.47.0)
       multi_json
     excon (0.99.0)
+    java-properties (0.3.0)
     json (2.6.3)
     language_server-protocol (3.17.0.3)
     lint_roller (1.0.0)
@@ -32,7 +34,7 @@ GEM
     rainbow (3.1.1)
     rake (13.0.6)
     regexp_parser (2.8.0)
-    rexml (3.3.9)
+    rexml (3.4.2)
     rubocop (1.50.2)
       json (~> 2.3)
       parallel (~> 1.10)