Bump irb from 1.14.3 to 1.15.1 (#2352)

Bumps [irb](https://github.com/ruby/irb) from 1.14.3 to 1.15.1.
- [Release notes](https://github.com/ruby/irb/releases)
- [Commits](ruby/irb@v1.14.3...v1.15.1)

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

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

Gemfile.lock

@@ -147,7 +147,8 @@ GEM
     ice_nine (0.11.2)
     iniparse (1.5.0)
     io-console (0.8.0)
-    irb (1.14.3)
+    irb (1.15.1)
+      pp (>= 0.6.0)
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
     jbuilder (2.13.0)
@@ -212,6 +213,9 @@ GEM
       racc
     pg (1.5.9)
     popper_js (2.11.8)
+    pp (0.6.2)
+      prettyprint
+    prettyprint (0.2.0)
     process_exists (0.2.0)
     psych (5.2.3)
       date