Excavator: Upgrade buildscript dependencies (#156)

###### _excavator_ is a bot for automating changes across repositories.

Changes produced by the roomba/roomba-lint check.

{runtimeCheckDesc}
To enable or disable this check, please contact the maintainers of Excavator.

build.gradle

@@ -28,7 +28,7 @@ buildscript {
         classpath 'com.palantir.baseline:gradle-baseline-java:0.57.0'
         classpath 'com.palantir.gradle.gitversion:gradle-git-version:0.11.0'
         classpath 'gradle.plugin.org.inferred:gradle-processors:2.2.0'
-        classpath 'com.palantir.gradle.consistentversions:gradle-consistent-versions:1.6.0'
+        classpath 'com.palantir.gradle.consistentversions:gradle-consistent-versions:1.7.1'
     }
 }