nginxMainline: 1.19.8 -> 1.19.9

[ajs124]

Motivation for this change

Changes with nginx 1.19.9                                        30 Mar 2021

    *) Bugfix: nginx could not be built with the mail proxy module, but
       without the ngx_mail_ssl_module; the bug had appeared in 1.19.8.

    *) Bugfix: "upstream sent response body larger than indicated content
       length" errors might occur when working with gRPC backends; the bug
       had appeared in 1.19.1.

    *) Bugfix: nginx might not close a connection till keepalive timeout
       expiration if the connection was closed by the client while
       discarding the request body.

    *) Bugfix: nginx might not detect that a connection was already closed
       by the client when waiting for auth_delay or limit_req delay, or when
       working with backends.

    *) Bugfix: in the eventport method.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[zakame]

Result of nixpkgs-review pr 118078 run on Other x86_64-linux 1

1 package built:

• nginxMainline