[PROF-11007] Upgrade to libdatadog 14.3.1

**What does this PR do?**

This PR upgrades the datadog gem to use libdatadog 14.3.1.

There were no needed API changes, it's a drop-in upgrade.

**Motivation:**

Staying on the latest libdatadog enables us to pick up the latest
improvements and also makes it easier to develop new features that need
libdatadog changes.

**Additional Notes:**

As usual, I'm opening this PR as a draft as libdatadog 14.3.1 is not yet
available on rubygems.org, and I'll come back to re-trigger CI and mark
this as non-draft once it is.

**How to test the change?**

Our existing test coverage includes libdatadog testing, so a green CI is good here :)

datadog.gemspec

@@ -69,7 +69,7 @@ Gem::Specification.new do |spec|
 
   # When updating the version here, please also update the version in `libdatadog_extconf_helpers.rb`
   # (and yes we have a test for it)
-  spec.add_dependency 'libdatadog', '~> 14.1.0.1.0'
+  spec.add_dependency 'libdatadog', '~> 14.3.1.1.0'
 
   spec.extensions = [
     'ext/datadog_profiling_native_extension/extconf.rb',

ext/libdatadog_extconf_helpers.rb

@@ -8,7 +8,7 @@ module Datadog
   module LibdatadogExtconfHelpers
     # Used to make sure the correct gem version gets loaded, as extconf.rb does not get run with "bundle exec" and thus
     # may see multiple libdatadog versions. See https://github.com/DataDog/dd-trace-rb/pull/2531 for the horror story.
-    LIBDATADOG_VERSION = '~> 14.1.0.1.0'
+    LIBDATADOG_VERSION = '~> 14.3.1.1.0'
 
     # Used as an workaround for a limitation with how dynamic linking works in environments where the datadog gem and
     # libdatadog are moved after the extension gets compiled.