Bump spring-core from 5.3.14 to 5.3.18

Bumps [spring-core](https://github.com/spring-projects/spring-framework) from 5.3.14 to 5.3.18. - [Release notes](https://github.com/spring-projects/spring-framework/releases) - [Commits](spring-projects/spring-framework@v5.3.14...v5.3.18) --- updated-dependencies: - dependency-name: org.springframework:spring-core dependency-type: direct:production ... Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -21,7 +21,7 @@
  <WxJava.version>4.2.0</WxJava.version>
  <junit.version>4.13.1</junit.version>
  <slf4j.version>1.7.21</slf4j.version>
- <spring.version>5.3.14</spring.version>
+ <spring.version>5.3.18</spring.version>
  <freemarker.version>2.3.23</freemarker.version>
  <commons.fileupload.version>1.3.3</commons.fileupload.version>
  <commons.codec.version>1.9</commons.codec.version>