Remove request_unbuffered policy

[tkan145]

APIcast comes with a new policy called request_unbuffered which allows requests to bypass Nginx's default buffering mechanism and may pose a threat to our cloud hosted APIcast. So let's remove it from the list

[slopezz]

Hi @tkan145 , the mapping-service test (even before your addition) was failing because of https://github.com/3scale/apicast-cloud-hosted/actions/runs/13583194430/job/37972741260 :

ERROR: ...t/src/lua_modules/share/lua/5.1/apicast/policy_chain.lua:61: module "apicast.policy.load_configuration" could not be loaded: ...pp-root/src/lua_modules/share/lua/5.1/resty/oidc/jwk.lua:4: module 'resty.openssl.pkey' not found:No LuaRocks module found for resty.openssl.pkey

I added a commit 1d7be38 that fixes the mapping-service tests by adding latest version of a new dependency lua-resty-openssl 1.5.2 , but TBH I don't know if the addition of this new dependency has any possible (negative) impact, can you please validate?

cc @roivaz given your experience with apicast-cloud-hosted, do you have anything to say?

[roivaz]

I don't see a problem with it so let's go ahead and merge this. Any issue, we should catch while testing in staging.