deps: update dependency com.diffplug.spotless:spotless-maven-plugin to v2.46.0

Author: renovate-bot

google-cloud-firestore/pom.xml

@@ -291,7 +291,7 @@
  <plugin>
  <groupId>com.diffplug.spotless</groupId>
  <artifactId>spotless-maven-plugin</artifactId>
- <version>2.45.0</version>
+ <version>2.46.0</version>
  <configuration>
  <kotlin>
  <includes>