fix: samples/openapi3/server/petstore/springboot-3/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-ORGSPRINGFRAMEWORK-8230368

Author: snyk-bot

samples/openapi3/server/petstore/springboot-3/pom.xml

@@ -10,7 +10,7 @@
         <maven.compiler.source>${java.version}</maven.compiler.source>
         <maven.compiler.target>${java.version}</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <springdoc.version>2.6.0</springdoc.version>
+        <springdoc.version>2.7.0</springdoc.version>
         <swagger-ui.version>5.17.14</swagger-ui.version>
     </properties>
     <parent>