build(deps): bump pg from 1.6.2 to 1.6.3 in /test/lang/ruby

Bumps [pg](https://github.com/ged/ruby-pg) from 1.6.2 to 1.6.3.
- [Changelog](https://github.com/ged/ruby-pg/blob/master/CHANGELOG.md)
- [Commits](ged/ruby-pg@v1.6.2...v1.6.3)

---
updated-dependencies:
- dependency-name: pg
  dependency-version: 1.6.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

test/lang/ruby/Gemfile

@@ -1,3 +1,3 @@
 source "https://rubygems.org"
-gem "pg", "~> 1.6.2"
+gem "pg", "~> 1.6.3"
 gem "test-unit", "~> 3.6.1"

test/lang/ruby/Gemfile.lock

@@ -1,9 +1,9 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    pg (1.6.2-aarch64-linux)
-    pg (1.6.2-arm64-darwin)
-    pg (1.6.2-x86_64-linux)
+    pg (1.6.3-aarch64-linux)
+    pg (1.6.3-arm64-darwin)
+    pg (1.6.3-x86_64-linux)
     power_assert (2.0.3)
     test-unit (3.6.1)
       power_assert
@@ -14,7 +14,7 @@ PLATFORMS
   x86_64-linux-gnu
 
 DEPENDENCIES
-  pg (~> 1.6.2)
+  pg (~> 1.6.3)
   test-unit (~> 3.6.1)
 
 BUNDLED WITH