Bump pghero from 2.5.1 to 2.6.0 (#14423)

Bumps [pghero](https://github.com/ankane/pghero) from 2.5.1 to 2.6.0.
- [Release notes](https://github.com/ankane/pghero/releases)
- [Changelog](https://github.com/ankane/pghero/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ankane/pghero/compare/v2.5.1...v2.6.0)

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

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

Gemfile

@@ -17,7 +17,7 @@ gem 'e2mmap', '~> 0.1.0'
 gem 'hamlit-rails', '~> 0.2'
 gem 'pg', '~> 1.2'
 gem 'makara', '~> 0.4'
-gem 'pghero', '~> 2.5'
+gem 'pghero', '~> 2.6'
 gem 'dotenv-rails', '~> 2.7'
 
 gem 'aws-sdk-s3', '~> 1.73', require: false

Gemfile.lock

@@ -286,7 +286,7 @@ GEM
     httplog (1.4.3)
       rack (>= 1.0)
       rainbow (>= 2.0.0)
-    i18n (1.8.3)
+    i18n (1.8.5)
       concurrent-ruby (~> 1.0)
     i18n-tasks (0.9.31)
       activesupport (>= 4.0.2)
@@ -415,7 +415,7 @@ GEM
       equatable (~> 0.6)
       tty-color (~> 0.5)
     pg (1.2.3)
-    pghero (2.5.1)
+    pghero (2.6.0)
       activerecord (>= 5)
     pkg-config (1.4.1)
     premailer (1.11.1)
@@ -747,7 +747,7 @@ DEPENDENCIES
   parallel_tests (~> 3.0)
   parslet
   pg (~> 1.2)
-  pghero (~> 2.5)
+  pghero (~> 2.6)
   pkg-config (~> 1.4)
   posix-spawn!
   premailer-rails