chore(proxy-cache) bump plugin from 1.2 to 1.3 (#5490)
chore(proxy-cache) bump plugin from 1.2 to 1.3 (#5490)

### Summary

Proxy cache changelog:

- remove api related code from the plugin
- use kong pdk and localize vars
- fix https://github.com/Kong/kong-plugin-proxy-cache/pull/17
- close https://github.com/Kong/kong-plugin-proxy-cache/pull/18
Kong/kong,Kong/kong,Kong/kong