Use build-tools 26.0.1 in plugin tests as well

Author: mannodermaus

android-junit5/src/test/groovy/de/mannodermaus/gradle/plugins/android_junit5/AndroidJUnitPlatformSpec.groovy

@@ -16,7 +16,7 @@ import spock.lang.Specification
 abstract class AndroidJUnitPlatformSpec extends Specification {
 
     protected static final COMPILE_SDK = 26
-    protected static final BUILD_TOOLS = "26.0.0"
+    protected static final BUILD_TOOLS = "26.0.1"
     protected static final MIN_SDK = 26
     protected static final TARGET_SDK = 26
     protected static final VERSION_CODE = 1