fix: astra-spring-boot-autoconfigure/pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGSPRINGFRAMEWORKBOOT-6091929

Author: snyk-bot

astra-spring-boot-autoconfigure/pom.xml

@@ -12,7 +12,7 @@
   </parent>
 
   <properties>
-    <spring-boot.version>2.7.14</spring-boot.version>
+    <spring-boot.version>2.7.18</spring-boot.version>
   </properties>
 
   <dependencies>