Update OpenFeature SDK dependency lower bound from 1.13.0 to 1.16.0

Fixes #40

The dependency range [1.13.0,2.0.0) has two issues:

1. Compilation failure: SDK versions [1.13.0,1.14.1) lack
   TrackingEventDetails.getValue() (no-arg), causing Provider.java
   to fail to compile.

2. Binary incompatibility: SDK versions below 1.16.0 define
   EventProvider.emit*() methods with void return type, but 1.16.0+
   changed them to return Awaitable. Code compiled against <1.16.0
   throws NoSuchMethodError at runtime with SDK 1.16.0+.

Raising the lower bound to 1.16.0 fixes both issues.

Co-Authored-By: rlamb@launchdarkly.com <kingdewman@gmail.com>

Author: devin-ai-integration[bot]

build.gradle

@@ -107,7 +107,7 @@ nexusPublishing {
 dependencies {
     implementation group: 'com.launchdarkly', name: 'launchdarkly-java-server-sdk', version: '[7.1.0, 8.0.0)'
 
-    implementation 'dev.openfeature:sdk:[1.13.0,2.0.0)'
+    implementation 'dev.openfeature:sdk:[1.16.0,2.0.0)'
 
     // Use JUnit test framework
     testImplementation(platform('org.junit:junit-bom:5.10.0'))