Bump pkg-config from 1.4.9 to 1.5.1 (#21820)

Bumps [pkg-config](https://github.com/ruby-gnome/pkg-config) from 1.4.9 to 1.5.1.
- [Release notes](https://github.com/ruby-gnome/pkg-config/releases)
- [Changelog](https://github.com/ruby-gnome/pkg-config/blob/master/NEWS)
- [Commits](https://github.com/ruby-gnome/pkg-config/compare/1.4.9...1.5.1)

---
updated-dependencies:
- dependency-name: pkg-config
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile

@@ -3,7 +3,7 @@
 source 'https://rubygems.org'
 ruby '>= 2.7.0', '< 3.1.0'
 
-gem 'pkg-config', '~> 1.4'
+gem 'pkg-config', '~> 1.5'
 gem 'rexml', '~> 3.2'
 
 gem 'puma', '~> 5.6'

Gemfile.lock

@@ -462,7 +462,7 @@ GEM
     pg (1.4.5)
     pghero (2.8.3)
       activerecord (>= 5)
-    pkg-config (1.4.9)
+    pkg-config (1.5.1)
     posix-spawn (0.3.15)
     premailer (1.18.0)
       addressable
@@ -810,7 +810,7 @@ DEPENDENCIES
   parslet
   pg (~> 1.4)
   pghero (~> 2.8)
-  pkg-config (~> 1.4)
+  pkg-config (~> 1.5)
   posix-spawn
   premailer-rails
   private_address_check (~> 0.5)