fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGSPRINGFRAMEWORK-8230365

Author: snyk-bot

pom.xml

@@ -118,7 +118,7 @@
     <shiro-extras.version>1.1.0</shiro-extras.version>
     <slf4j.version>1.7.12</slf4j.version>
     <snakeyaml.version>1.16</snakeyaml.version>
-    <spring.version>4.3.30.RELEASE</spring.version>
+    <spring.version>6.1.14</spring.version>
     <spring-batch.version>3.0.10.RELEASE</spring-batch.version>
     <sshd.version>0.8.0</sshd.version>
     <totp.version>1.7.1</totp.version>