Bump bootsnap from 1.13.0 to 1.15.0 (#991)

Bumps [bootsnap](https://github.com/Shopify/bootsnap) from 1.13.0 to 1.15.0.
- [Release notes](https://github.com/Shopify/bootsnap/releases)
- [Changelog](https://github.com/Shopify/bootsnap/blob/main/CHANGELOG.md)
- [Commits](Shopify/bootsnap@v1.13.0...v1.15.0)

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

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

Gemfile.lock

@@ -109,7 +109,7 @@ GEM
     aws-sigv4 (1.5.2)
       aws-eventstream (~> 1, >= 1.0.2)
     bcrypt (3.1.18)
-    bootsnap (1.13.0)
+    bootsnap (1.15.0)
       msgpack (~> 1.2)
     bootstrap-kaminari-views (0.0.5)
       kaminari (>= 0.13)
@@ -307,7 +307,7 @@ GEM
     minitest (5.16.3)
     momentjs-rails (2.29.4.1)
       railties (>= 3.1)
-    msgpack (1.5.6)
+    msgpack (1.6.0)
     multi_json (1.15.0)
     multipart-post (2.2.3)
     nested_form (0.3.2)