fix(deps): update dependency com.mebigfatguy.fb-contrib:fb-contrib to v7.6.15

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gradle/verification-metadata.xml

@@ -222,6 +222,7 @@
             <trusting group="com.mebigfatguy.fb-contrib" name="fb-contrib" version="7.6.11"/>
             <trusting group="com.mebigfatguy.fb-contrib" name="fb-contrib" version="7.6.12"/>
             <trusting group="com.mebigfatguy.fb-contrib" name="fb-contrib" version="7.6.14"/>
+            <trusting group="com.mebigfatguy.fb-contrib" name="fb-contrib" version="7.6.15"/>
          </trusted-key>
          <trusted-key id="AFCC4C7594D09E2182C60E0F7A01B0F236E5430F" group="com.google.code.gson"/>
          <trusted-key id="B02335AA54CCF21E52BBF9ABD9C565AA72BA2FDD" group="io.grpc"/>

lib/build.gradle

@@ -135,7 +135,7 @@ dependencies {
     implementation 'com.squareup.okhttp3:okhttp:4.12.0'
 
     spotbugsPlugins 'com.h3xstream.findsecbugs:findsecbugs-plugin:1.14.0'
-    spotbugsPlugins 'com.mebigfatguy.fb-contrib:fb-contrib:7.6.14'
+    spotbugsPlugins 'com.mebigfatguy.fb-contrib:fb-contrib:7.6.15'
 
     ktlint "com.pinterest.ktlint:ktlint-cli:1.7.1"