fix: bump OpenTelemetry Schema URL to 1.21.0

[guicassolato]

Fixes an error in the initialization of Authorino when tracing services are enabled.

Error message:

cannot merge resource due to conflicting Schema URL

Stacktrace:

main.setupTelemetryServices
	/usr/src/authorino/main.go:409
main.setup
	/usr/src/authorino/main.go:387
main.runAuthorizationServer
	/usr/src/authorino/main.go:225
github.com/spf13/cobra.(*Command).execute
	/opt/app-root/src/go/pkg/mod/github.com/spf13/[email protected]/command.go:944
github.com/spf13/cobra.(*Command).ExecuteC
	/opt/app-root/src/go/pkg/mod/github.com/spf13/[email protected]/command.go:1068
github.com/spf13/cobra.(*Command).Execute
	/opt/app-root/src/go/pkg/mod/github.com/spf13/[email protected]/command.go:992
github.com/spf13/cobra.(*Command).ExecuteContext
	/opt/app-root/src/go/pkg/mod/github.com/spf13/[email protected]/command.go:985
main.main
	/usr/src/authorino/main.go:149
runtime.main
	/usr/lib/golang/src/runtime/proc.go:250

This was likely caused after upgrading otel deps to v0.46.x (#448) and it's a known issue of otel's Resource API: open-telemetry/opentelemetry-go#2341.

[Boomatang]

Build image locally and image worked with on Kuadrant/kuadrant-operator#393
/lgtm