Bump bootsnap from 1.7.5 to 1.7.6 (#14350)

Bumps [bootsnap](https://github.com/Shopify/bootsnap) from 1.7.5 to 1.7.6.
- [Release notes](https://github.com/Shopify/bootsnap/releases)
- [Changelog](https://github.com/Shopify/bootsnap/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Shopify/bootsnap/compare/v1.7.5...v1.7.6)

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

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

Gemfile.lock

@@ -120,7 +120,7 @@ GEM
       chartkick (>= 3.2)
       railties (>= 5)
       safely_block (>= 0.1.1)
-    bootsnap (1.7.5)
+    bootsnap (1.7.6)
       msgpack (~> 1.0)
     brakeman (5.1.1)
     browser (5.3.1)