Also need version bump in Gemfile.lock

CI caught this
```
bundle install
/opt/hostedtoolcache/Ruby/2.7.8/x64/bin/bundle config --local path /home/runner/work/pushmi_pullyu/pushmi_pullyu/vendor/bundle
/opt/hostedtoolcache/Ruby/2.7.8/x64/bin/bundle config --local deployment true
Cache key: setup-ruby-bundler-cache-v6-ubuntu-22.04-x64-ruby-2.7.8-wd-/home/runner/work/pushmi_pullyu/pushmi_pullyu-with--without--only--Gemfile.lock-3b2d9c47aa01bf40bd8bedb47d0c24435d417cbf97b7a439a5fb1341ea4cdf65
Cache Size: ~17 MB (17465525 B)
/usr/bin/tar -xf /home/runner/work/_temp/eb44312a-798f-4d66-bf5e-bea883d3f6da/cache.tzst -P -C /home/runner/work/pushmi_pullyu/pushmi_pullyu --use-compress-program unzstd
Cache restored successfully
Found cache for key: setup-ruby-bundler-cache-v6-ubuntu-22.04-x64-ruby-2.7.8-wd-/home/runner/work/pushmi_pullyu/pushmi_pullyu-with--without--only--Gemfile.lock-3b2d9c47aa01bf40bd8bedb47d0c24435d417cbf97b7a439a5fb1341ea4cdf65
/opt/hostedtoolcache/Ruby/2.7.8/x64/bin/bundle install --jobs 4
You are trying to install in deployment mode after changing
your Gemfile. Run `bundle install` elsewhere and add the
updated Gemfile.lock to version control.

If this is a development machine, remove the
/home/runner/work/pushmi_pullyu/pushmi_pullyu/Gemfile freeze
by running `bundle config unset deployment`.

The gemspecs for path gems changed
```

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    pushmi_pullyu (2.1.4)
+    pushmi_pullyu (2.1.5)
       activesupport (>= 5, < 7.2)
       bagit (~> 0.4)
       connection_pool (~> 2.2)