Configure tls_certificate_check for tls config in swoosh

OTP 26 changed the error level of what we're seeing when trying to send
email to SES via TLS. This additional configuration should let us
communicate via TLS without issues.

See gen-smtp/gen_smtp#328

config/runtime.exs

@@ -293,6 +293,7 @@ if config_env() == :prod do
       password: System.fetch_env!("SMTP_PASSWORD"),
       ssl: System.get_env("SMTP_SSL", "false") == "true",
       tls: :always,
+      tls_options: :tls_certificate_check.options(System.fetch_env!("SMTP_SERVER")),
       retries: 1
   end
 end

mix.exs

@@ -96,6 +96,7 @@ defmodule NervesHub.MixProject do
       {:telemetry_metrics_statsd, "~> 0.7.0"},
       {:telemetry_poller, "~> 1.0"},
       {:timex, "~> 3.1"},
+      {:tls_certificate_check, "~> 1.0"},
       {:x509, "~> 0.5.1 or ~> 0.6"}
     ]
   end

mix.lock

@@ -74,6 +74,7 @@
   "telemetry_poller": {:hex, :telemetry_poller, "1.0.0", "db91bb424e07f2bb6e73926fcafbfcbcb295f0193e0a00e825e589a0a47e8453", [:rebar3], [{:telemetry, "~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "b3a24eafd66c3f42da30fc3ca7dda1e9d546c12250a2d60d7b81d264fbec4f6e"},
   "thousand_island": {:hex, :thousand_island, "1.3.3", "d193a0e268f44a2d09efc6b2d8b39cf37fc65ce99fc421deca6260759d6eb204", [:mix], [{:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "adc328b15f10012769dcc3aeb14d4855790cd5ea34e4c6a701f334516084e750"},
   "timex": {:hex, :timex, "3.7.11", "bb95cb4eb1d06e27346325de506bcc6c30f9c6dea40d1ebe390b262fad1862d1", [:mix], [{:combine, "~> 0.10", [hex: :combine, repo: "hexpm", optional: false]}, {:gettext, "~> 0.20", [hex: :gettext, repo: "hexpm", optional: false]}, {:tzdata, "~> 1.1", [hex: :tzdata, repo: "hexpm", optional: false]}], "hexpm", "8b9024f7efbabaf9bd7aa04f65cf8dcd7c9818ca5737677c7b76acbc6a94d1aa"},
+  "tls_certificate_check": {:hex, :tls_certificate_check, "1.22.1", "0f450cc1568a67a65ce5e15df53c53f9a098c3da081c5f126199a72505858dc1", [:rebar3], [{:ssl_verify_fun, "~> 1.1", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}], "hexpm", "3092be0babdc0e14c2e900542351e066c0fa5a9cf4b3597559ad1e67f07938c0"},
   "tzdata": {:hex, :tzdata, "1.1.1", "20c8043476dfda8504952d00adac41c6eda23912278add38edc140ae0c5bcc46", [:mix], [{:hackney, "~> 1.17", [hex: :hackney, repo: "hexpm", optional: false]}], "hexpm", "a69cec8352eafcd2e198dea28a34113b60fdc6cb57eb5ad65c10292a6ba89787"},
   "unicode_util_compat": {:hex, :unicode_util_compat, "0.7.0", "bc84380c9ab48177092f43ac89e4dfa2c6d62b40b8bd132b1059ecc7232f9a78", [:rebar3], [], "hexpm", "25eee6d67df61960cf6a794239566599b09e17e668d3700247bc498638152521"},
   "websock": {:hex, :websock, "0.5.3", "2f69a6ebe810328555b6fe5c831a851f485e303a7c8ce6c5f675abeb20ebdadc", [:mix], [], "hexpm", "6105453d7fac22c712ad66fab1d45abdf049868f253cf719b625151460b8b453"},