Update dependency com.diffplug.spotless:spotless-maven-plugin to v3.2.1 (#265)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pom.xml

@@ -52,7 +52,7 @@
     <maven.compiler.target>21</maven.compiler.target>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
-    <spotless.version>3.2.0</spotless.version>
+    <spotless.version>3.2.1</spotless.version>
     <slf4j.version>2.0.17</slf4j.version>
     <autograder.version>0.8.2</autograder.version>
     <jgit.version>7.5.0.202512021534-r</jgit.version>