Bump airbrake from 4.0.0 to 8.1.2

Bumps [airbrake](https://github.com/airbrake/airbrake) from 4.0.0 to 8.1.2.
- [Release notes](https://github.com/airbrake/airbrake/releases)
- [Changelog](https://github.com/airbrake/airbrake/blob/master/CHANGELOG.md)
- [Commits](airbrake/airbrake@v4.0.0...v8.1.2)

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

Author: dependabot-support

Gemfile.lock

@@ -37,9 +37,10 @@ GEM
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
     addressable (2.3.6)
-    airbrake (4.0.0)
-      builder
-      multi_json
+    airbrake (8.1.2)
+      airbrake-ruby (~> 3.2)
+    airbrake-ruby (3.2.4)
+      rbtree3 (~> 0.5)
     annotate (2.6.5)
       activerecord (>= 2.3.0)
       rake (>= 0.8.7)
@@ -727,7 +728,7 @@ GEM
     minitest (5.11.3)
     momentjs-rails (2.7.0)
       railties (>= 3.1)
-    multi_json (1.11.2)
+    multi_json (1.13.1)
     neat (1.5.1)
       bourbon (>= 3.1)
       sass (~> 3.2.19)
@@ -789,6 +790,7 @@ GEM
       thor (>= 0.18.1, < 2.0)
     raindrops (0.19.0)
     rake (12.3.1)
+    rbtree3 (0.5.0)
     recipient_interceptor (0.1.2)
       mail
     redcarpet (3.4.0)