Fix suppression for .jar, .git, .ico, .p12, .svg, and .png files

Closes gh-17082

Author: wilkinsona

spring-boot-parent/src/checkstyle/checkstyle-suppressions.xml

@@ -6,7 +6,7 @@
 	<suppress files="[\\/]transaction-logs[\\/]" checks=".*" />
 	<suppress files="[\\/]target[\\/]" checks=".*" />
 	<suppress files="[\\/]build.log" checks=".*" />
-	<suppress files=".+\.[jar|git|ico|p12]" checks=".*" />
+	<suppress files=".+\.(jar|git|ico|p12)" checks=".*" />
 	<suppress files="SpringApplicationTests\.java" checks="FinalClass" />
 	<suppress files=".+Configuration\.java" checks="HideUtilityClassConstructor" />
 	<suppress files=".+Application\.java" checks="HideUtilityClassConstructor" />