use fixed spotbug version

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

build.gradle

@@ -392,6 +392,10 @@ dependencies {
     androidTestImplementation 'net.bytebuddy:byte-buddy:1.10.12'
 }
 
+spotbugs {
+    toolVersion = '3.1.12'
+}
+
 configurations.all {
     resolutionStrategy.cacheChangingModulesFor 0, 'seconds'
 }