Fix lintchecks module

[SUPERCILEX]

Fixes #1116

We'll only get lint errors on our debug builds, but this means we don't have to publish the module. 👍

[samtstern]

Confirmed:

$ diff ~/.m2/repository/com/firebaseui/firebase-ui-auth/3.2.0/firebase-ui-auth-3.2.0.pom ~/.m2/repository/com/firebaseui/firebase-ui-auth/3.2.1-SNAPSHOT/firebase-ui-auth-3.2.1-SNAPSHOT.pom
6c6
<   <version>3.2.0</version>
---
>   <version>3.2.1-SNAPSHOT</version>
49,54d48
<       <scope>runtime</scope>
<     </dependency>
<     <dependency>
<       <groupId>firebaseui-android.internal</groupId>
<       <artifactId>lintchecks</artifactId>
<       <version>unspecified</version>

[SUPERCILEX]

Sweet!