Merge pull request #1159 from jbockler/bundler-deprecation

bundler deprecated the usage of `Bundler.rubygems.all_specs`
with version 2.5.12 (June 13, 2024), in order to better
support default gems.
This version is the new default version with ruby 3.3.3
and thus the warning pops up:

Bundler.rubygems.all_specs has been removed in favor
of Bundler.rubygems.installed_specs

.changesets/fix-deprecation-of-bundler-rubygems-all_specs.md

@@ -0,0 +1,6 @@
+---
+bump: "patch"
+type: "fix"
+---
+
+Fix deprecation warning of Bundler.rubygems.all_specs usage.

lib/appsignal/environment.rb

@@ -121,7 +121,12 @@ def self.report(key)
     def self.report_supported_gems
       return unless defined?(Bundler) # Do nothing if Bundler is not present
 
-      bundle_gem_specs = ::Bundler.rubygems.all_specs
+      bundle_gem_specs =
+        if ::Bundler.rubygems.respond_to?(:installed_specs)
+          ::Bundler.rubygems.installed_specs
+        else
+          ::Bundler.rubygems.all_specs
+        end
       SUPPORTED_GEMS.each do |gem_name|
         gem_spec = bundle_gem_specs.find { |spec| spec.name == gem_name }
         next unless gem_spec