LUCENE-9920: Remove binary gradle-wrapper.jar from the repository

.gitignore

@@ -1,9 +1,12 @@
-# Gradle
+# Gradle.
 # Ignore the generated local settings file.
 /gradle.properties
 .gradle/
 build/
 
+# Ignore gradle wrapper jar.
+gradle/wrapper/gradle-wrapper.jar
+
 # IntelliJ IDEA
 /.idea/
 #    IntelliJ creates this folder, ignore.
@@ -13,6 +16,7 @@ build/
 /.project
 /.classpath
 /.settings/
+
 # Eclipse Gradle oddity
 **/bin/default/