Bump shiro-core from 1.7.1 to 1.9.1

Bumps [shiro-core](https://github.com/apache/shiro) from 1.7.1 to 1.9.1.
- [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-1.7.1...shiro-root-1.9.1)

---
updated-dependencies:
- dependency-name: org.apache.shiro:shiro-core
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -17,7 +17,7 @@
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <java.version>1.8</java.version>
         <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
-        <shiro.version>1.7.1</shiro.version>
+        <shiro.version>1.9.1</shiro.version>
         <thymeleaf.extras.shiro.version>2.0.0</thymeleaf.extras.shiro.version>
         <druid.version>1.2.6</druid.version>
         <bitwalker.version>1.21</bitwalker.version>