Update Helm release oauth2-proxy to v8.3.0
No problems deploying to Proxmox VE K3s Kubernetes cluster via Helm Chart and Flux V2 reconciliation in a GitOps approach with dependency update facilitated by Mend's Renovate Bot. This MR contains the following updates: Package Update Change oauth2-proxy (source) minor 8.2.1 -> 8.3.0