chore(deps): update dependency io.gravitee:gravitee-bom to v8

Author: renovate[bot]

Diff for: pom.xml

@@ -35,7 +35,7 @@
 
     <properties>
         <gravitee-apim-gateway-tests-sdk.version>3.21.0-SNAPSHOT</gravitee-apim-gateway-tests-sdk.version>
-        <gravitee-bom.version>4.0.3</gravitee-bom.version>
+        <gravitee-bom.version>8.1.7</gravitee-bom.version>
         <gravitee-gateway-api.version>2.1.0</gravitee-gateway-api.version>
         <gravitee-policy-api.version>1.11.0</gravitee-policy-api.version>
         <json-schema-generator-maven-plugin.version>1.1.0</json-schema-generator-maven-plugin.version>