I am facing the same issue. My attempt to update from 2.16.7 to 3.15.1 using maven framework ended up with this error:

mvn io.quarkus.platform:quarkus-maven-plugin:3.15.1:update -N -Dstream="3.2"

[ERROR] Failed to execute goal io.quarkus.platform:quarkus-maven-plugin:3.15.1:update (default-cli) on project ca-toronto-kogito-ds: Failed to initialize Quarkus extension resolver: Failed to resolve the Quarkus extension registry descriptor of registry.quarkus.io from registry.quarkus.io (https://registry.quarkus.io/maven): Failed to resolve artifact io.quarkus.registry:quarkus-registry-descriptor:json:1.0-SNAPSHOT: The following artifacts could not be resolved: io.quarkus.registry:quarkus-registry-descriptor:json:1.0-SNAPSHOT (absent): Could not transfer artifact io.quarkus.registry:quarkus-registry-descriptor:json:1.0-SNAPSHOT from/to registry.quarkus.io (https://registry.quarkus.io/maven): PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target -> [Help 1] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

Maven url https://registry.quarkus.io/maven returns an HTTP 404

Can anybody help on this ?