build(deps): bump httpoison from 1.8.0 to 2.1.0

Bumps [httpoison](https://github.com/edgurgel/httpoison) from 1.8.0 to 2.1.0.
- [Release notes](https://github.com/edgurgel/httpoison/releases)
- [Commits](edgurgel/httpoison@v1.8.0...v2.1.0)

---
updated-dependencies:
- dependency-name: httpoison
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

mix.exs

@@ -70,7 +70,7 @@ defmodule Concentrate.MixProject do
       {:lcov_ex, "~> 0.2.0", only: :test, runtime: false},
       {:gen_stage, "~> 1.0"},
       {:gpb, "~> 4.7", only: :dev, runtime: false, only: :dev},
-      {:httpoison, "~> 1.0"},
+      {:httpoison, "~> 2.1"},
       {:jason, "~> 1.0"},
       {:stream_data, "~> 0.4", only: :test},
       {:tzdata, "~> 1.1.1"},

mix.lock

@@ -19,7 +19,7 @@
   "gen_stage": {:hex, :gen_stage, "1.1.0", "dd0c0f8d2f3b993fdbd3d58e94abbe65380f4e78bdee3fa93d5618d7d14abe60", [:mix], [], "hexpm", "7f2b36a6d02f7ef2ba410733b540ec423af65ec9c99f3d1083da508aca3b9305"},
   "gpb": {:hex, :gpb, "4.18.0", "305548ad991583f4b9809e905d6a17475ab8df85116cb3c1269fda1e4424c7ea", [:make, :rebar3], [], "hexpm", "c2bb843866e627e1e0181c2f5e4b3ee79cbb8cd3574f66767e7f1d5130d6b025"},
   "hackney": {:hex, :hackney, "1.18.1", "f48bf88f521f2a229fc7bae88cf4f85adc9cd9bcf23b5dc8eb6a1788c662c4f6", [:rebar3], [{:certifi, "~> 2.9.0", [hex: :certifi, repo: "hexpm", optional: false]}, {:idna, "~> 6.1.0", [hex: :idna, repo: "hexpm", optional: false]}, {:metrics, "~> 1.0.0", [hex: :metrics, repo: "hexpm", optional: false]}, {:mimerl, "~> 1.1", [hex: :mimerl, repo: "hexpm", optional: false]}, {:parse_trans, "3.3.1", [hex: :parse_trans, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "~> 1.1.0", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}, {:unicode_util_compat, "~> 0.7.0", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm", "a4ecdaff44297e9b5894ae499e9a070ea1888c84afdd1fd9b7b2bc384950128e"},
-  "httpoison": {:hex, :httpoison, "1.8.0", "6b85dea15820b7804ef607ff78406ab449dd78bed923a49c7160e1886e987a3d", [:mix], [{:hackney, "~> 1.17", [hex: :hackney, repo: "hexpm", optional: false]}], "hexpm", "28089eaa98cf90c66265b6b5ad87c59a3729bea2e74e9d08f9b51eb9729b3c3a"},
+  "httpoison": {:hex, :httpoison, "2.1.0", "655fd9a7b0b95ee3e9a3b535cf7ac8e08ef5229bab187fa86ac4208b122d934b", [:mix], [{:hackney, "~> 1.17", [hex: :hackney, repo: "hexpm", optional: false]}], "hexpm", "fc455cb4306b43827def4f57299b2d5ac8ac331cb23f517e734a4b78210a160c"},
   "idna": {:hex, :idna, "6.1.1", "8a63070e9f7d0c62eb9d9fcb360a7de382448200fbbd1b106cc96d3d8099df8d", [:rebar3], [{:unicode_util_compat, "~>0.7.0", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm", "92376eb7894412ed19ac475e4a86f7b413c1b9fbb5bd16dccd57934157944cea"},
   "jason": {:hex, :jason, "1.4.0", "e855647bc964a44e2f67df589ccf49105ae039d4179db7f6271dfd3843dc27e6", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "79a3791085b2a0f743ca04cec0f7be26443738779d09302e01318f97bdb82121"},
   "jsx": {:hex, :jsx, "2.8.3", "a05252d381885240744d955fbe3cf810504eb2567164824e19303ea59eef62cf", [:mix, :rebar3], [], "hexpm"},