fix: Bump openssl dep to allow 4.x (#352)

Author: keelerm84

launchdarkly-server-sdk.gemspec

@@ -45,7 +45,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "concurrent-ruby", "~> 1.1"
   spec.add_runtime_dependency "ld-eventsource", "2.2.6"
   spec.add_runtime_dependency "observer", "~> 0.1.2"
-  spec.add_runtime_dependency "openssl", "~> 3.1", ">= 3.1.2"
+  spec.add_runtime_dependency "openssl", ">= 3.1.2", "< 5.0"
   spec.add_runtime_dependency "semantic", "~> 1.6"
   spec.add_runtime_dependency "zlib", "~> 3.1" unless RUBY_PLATFORM == "java"
   # Please keep ld-eventsource dependency as an exact version so that bugfixes to