[PROF-11203] Bump minimum version of datadog-ruby_core_source

**What does this PR do?**

This PR bumps the minimum version of the `datadog-ruby_core_source`
gem to 3.4.0.

**Motivation:**

This bump ensures that any customers upgrading dd-trace-rb also pick
up the latest version of `datadog-ruby_core_source`.

**Additional Notes:**

N/A

**How to test the change?**

Green CI means all ok :)

Author: ivoanjo

datadog.gemspec

@@ -62,7 +62,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'msgpack'
 
   # Used by the profiler native extension to support Ruby 2.5 and > 3.2, see NativeExtensionDesign.md for details
-  spec.add_dependency 'datadog-ruby_core_source', '~> 3.3', '>= 3.3.7'
+  spec.add_dependency 'datadog-ruby_core_source', '~> 3.4'
 
   # Used by appsec
   spec.add_dependency 'libddwaf', '~> 1.18.0.0.0'