Bump org.springframework:spring-expression in /easy-rules-spel

Bumps [org.springframework:spring-expression](https://github.com/spring-projects/spring-framework) from 5.3.18 to 5.3.26.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.3.18...v5.3.26)

---
updated-dependencies:
- dependency-name: org.springframework:spring-expression
  dependency-type: direct:production
...

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

easy-rules-spel/pom.xml

@@ -13,7 +13,7 @@
   <description>Spring Expression Language integration module</description>
 
   <properties>
-    <spring.version>5.3.18</spring.version>
+    <spring.version>5.3.26</spring.version>
   </properties>
 
   <scm>