Bump thruster from 0.1.9 to 0.1.15

Bumps [thruster](https://github.com/basecamp/thruster) from 0.1.9 to 0.1.15.
- [Changelog](https://github.com/basecamp/thruster/blob/main/CHANGELOG.md)
- [Commits](basecamp/thruster@v0.1.9...v0.1.15)

---
updated-dependencies:
- dependency-name: thruster
  dependency-version: 0.1.15
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -275,8 +275,8 @@ GEM
       railties (>= 6.0.0)
     stringio (3.1.2)
     thor (1.3.2)
-    thruster (0.1.9-aarch64-linux)
-    thruster (0.1.9-x86_64-linux)
+    thruster (0.1.15-aarch64-linux)
+    thruster (0.1.15-x86_64-linux)
     timeout (0.4.2)
     turbo-rails (2.0.11)
       actionpack (>= 6.0.0)