fix: samples/server/petstore/kotlin-springboot-request-cookie/pom.xml…

… to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGSPRINGFRAMEWORK-7945490
- https://snyk.io/vuln/SNYK-JAVA-ORGSPRINGFRAMEWORK-8230373
- https://snyk.io/vuln/SNYK-JAVA-ORGJETBRAINSKOTLIN-2393744
- https://snyk.io/vuln/SNYK-JAVA-ORGSPRINGFRAMEWORK-8230368

samples/server/petstore/kotlin-springboot-request-cookie/pom.xml

@@ -6,12 +6,12 @@
     <name>openapi-spring</name>
     <version>1.0.0</version>
     <properties>
-        <springdoc-openapi.version>2.2.0</springdoc-openapi.version>
+        <springdoc-openapi.version>2.7.0</springdoc-openapi.version>
         <findbugs-jsr305.version>3.0.2</findbugs-jsr305.version>
         <jakarta-annotation.version>2.1.0</jakarta-annotation.version>
         <kotlin-test-junit5.version>1.7.10</kotlin-test-junit5.version>
 
-        <kotlin.version>1.7.10</kotlin.version>
+        <kotlin.version>2.1.0</kotlin.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
     <parent>