Bump irb from 1.14.3 to 1.15.0

Bumps [irb](https://github.com/ruby/irb) from 1.14.3 to 1.15.0.
- [Release notes](https://github.com/ruby/irb/releases)
- [Commits](ruby/irb@v1.14.3...v1.15.0)

---
updated-dependencies:
- dependency-name: irb
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -134,7 +134,8 @@ GEM
     i18n (1.14.7)
       concurrent-ruby (~> 1.0)
     io-console (0.8.0)
-    irb (1.14.3)
+    irb (1.15.0)
+      pp (>= 0.6.0)
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
     json (2.9.1)
@@ -397,6 +398,9 @@ GEM
       racc
     pg (1.5.9)
     plek (5.2.0)
+    pp (0.6.2)
+      prettyprint
+    prettyprint (0.2.0)
     prometheus_exporter (2.2.0)
       webrick
     psych (5.2.3)