Bump shiro.version from 1.4.0 to 1.7.1

Bumps `shiro.version` from 1.4.0 to 1.7.1.

Updates `shiro-core` from 1.4.0 to 1.7.1
- [Release notes](https://github.com/apache/shiro/releases)
- [Changelog](https://github.com/apache/shiro/blob/main/RELEASE-NOTES)
- [Commits](https://github.com/apache/shiro/compare/shiro-root-1.4.0...shiro-root-1.7.1)

Updates `shiro-spring` from 1.4.0 to 1.7.1

Updates `shiro-ehcache` from 1.4.0 to 1.7.1
Signed-off-by: Ndependabot[bot] <support@github.com>

pom.xml

@@ -17,7 +17,7 @@
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 		<java.version>1.8</java.version>
-		<shiro.version>1.4.0</shiro.version>
+		<shiro.version>1.7.1</shiro.version>
 		<thymeleaf.extras.shiro.version>2.0.0</thymeleaf.extras.shiro.version>
 		<mybatis.boot.version>1.3.2</mybatis.boot.version>
 		<druid.version>1.1.14</druid.version>