Upgrade to Git Commit Id Plugin 2.2.6

Closes gh-15682

Author: wilkinsona

spring-boot-dependencies/pom.xml

@@ -195,7 +195,7 @@
 		<!-- Plugin versions -->
 		<build-helper-maven-plugin.version>1.10</build-helper-maven-plugin.version>
 		<exec-maven-plugin.version>1.5.0</exec-maven-plugin.version>
-		<git-commit-id-plugin.version>2.2.5</git-commit-id-plugin.version>
+		<git-commit-id-plugin.version>2.2.6</git-commit-id-plugin.version>
 		<maven-antrun-plugin.version>1.8</maven-antrun-plugin.version>
 		<maven-assembly-plugin.version>2.6</maven-assembly-plugin.version>
 		<maven-clean-plugin.version>2.6.1</maven-clean-plugin.version>