Double quote bug fix for jwks_uri

When running this chart today, I received this error (this is without the quotes even, although the umbrella chart in the BB main repo, says to use quotes).

[2023-04-24 20:16:07.746] [console] [error] main: Unexpected error: Expected , or } after key:value pair.
      "jwks_uri": ""https://keycloak.big
                    ^

How this is reproduced:

addons:
  authservice:
    enabled: true

    chains:
      full:
        ...
        jwks_uri: https://keycloak.bigbang.dev/auth/realms/baby-yoda/protocol/openid-connect/certs