fix(gofeatureflag): fix java.lang.NoClassDefFoundError

[thomaspoignant]

This PR

Not sure why, but the import org/apache/hc/core5/http/ContentType was working fine in the contrib repo BUT the dependency is not working on the built version.

Removing the link to this lib to be sure that we have no more NoClassDefFoundError errors.

org.gofeatureflag.integrationtests.ProviderTests.authenticatedRelayProxyInvalidToken -- Time elapsed: 0.004 s <<< ERROR!
java.lang.NoClassDefFoundError: org/apache/hc/core5/http/ContentType
	at dev.openfeature.contrib.providers.gofeatureflag.controller.GoFeatureFlagController.evaluateFlag(GoFeatureFlagController.java:138)
	at dev.openfeature.contrib.providers.gofeatureflag.GoFeatureFlagProvider.getEvaluation(GoFeatureFlagProvider.java:218)
	at dev.openfeature.contrib.providers.gofeatureflag.GoFeatureFlagProvider.getBooleanEvaluation(GoFeatureFlagProvider.java:80)
	at dev.openfeature.sdk.OpenFeatureClient.createProviderEvaluation(OpenFeatureClient.java:180)
	at dev.openfeature.sdk.OpenFeatureClient.evaluateFlag(OpenFeatureClient.java:123)
	at dev.openfeature.sdk.OpenFeatureClient.getBooleanDetails(OpenFeatureClient.java:223)
	at dev.openfeature.sdk.OpenFeatureClient.getBooleanDetails(OpenFeatureClient.java:217)
	at org.gofeatureflag.integrationtests.ProviderTests.authenticatedRelayProxyInvalidToken(ProviderTests.java:394)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
Caused by: java.lang.ClassNotFoundException: org.apache.hc.core5.http.ContentType
	... 11 more

[Kavindu-Dodan]

Please change this prior to merging - https://github.com/open-feature/java-sdk-contrib/pull/839/files#r1647703004