Upgrade protobuf to 1.33.0

[atanasovskib]

Avoid discovered vulnerability that is described as

The protojson.Unmarshal function can enter an infinite loop when 
unmarshaling certain forms of invalid JSON. This condition can 
occur when unmarshaling into a message which contains a 
google.protobuf.Any value, or when the UnmarshalOptions.DiscardUnknown 
option is set.

Additionaly, cilium upgrade in #104 required go 1.21, but we forgot
to update the GitHub actions, so I'm bumping the go version there too