Bump kafka_ex from 0.14.0 to 0.15.0

Bumps [kafka_ex](https://github.com/kafkaex/kafka_ex) from 0.14.0 to 0.15.0.
- [Release notes](https://github.com/kafkaex/kafka_ex/releases)
- [Changelog](https://github.com/kafkaex/kafka_ex/blob/master/CHANGELOG.md)
- [Commits](kafkaex/kafka_ex@v0.14.0...v0.15.0)

---
updated-dependencies:
- dependency-name: kafka_ex
  dependency-version: 0.15.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

mix.lock

@@ -21,7 +21,7 @@
   "hackney": {:hex, :hackney, "1.25.0", "390e9b83f31e5b325b9f43b76e1a785cbdb69b5b6cd4e079aa67835ded046867", [:rebar3], [{:certifi, "~> 2.15.0", [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, "~> 1.4", [hex: :mimerl, repo: "hexpm", optional: false]}, {:parse_trans, "3.4.1", [hex: :parse_trans, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "~> 1.1.0", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}, {:unicode_util_compat, "~> 0.7.1", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm", "7209bfd75fd1f42467211ff8f59ea74d6f2a9e81cbcee95a56711ee79fd6b1d4"},
   "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, "1.4.4", "b9226785a9aa77b6857ca22832cffa5d5011a667207eb2a0ad56adb5db443b8a", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "c5eb0cab91f094599f94d55bc63409236a8ec69a21a67814529e8d5f6cc90b3b"},
-  "kafka_ex": {:hex, :kafka_ex, "0.14.0", "1baefdc5e6c9f67613846fb2e5ee76f98b2d79aed67ae8884c58996d0f69683b", [:mix], [{:kayrock, "~> 0.2.0", [hex: :kayrock, repo: "hexpm", optional: false]}], "hexpm", "4ccab4c458cc027d24e58bff03594d37c5f1ead898bb7c596a66ae8169eb1dcf"},
+  "kafka_ex": {:hex, :kafka_ex, "0.15.0", "c32c8ee1a1da488e3f36f1b4ffcdfdc9a3f989138535bd97c1a7edef70ad7f73", [:mix], [{:kayrock, "~> 0.2.0-rc.1", [hex: :kayrock, repo: "hexpm", optional: false]}], "hexpm", "0b845ddc5b2263ac76f14cf339365752fd2848ba3cfc67730495742de7bec8a9"},
   "kayrock": {:hex, :kayrock, "0.2.0", "b2e55b555dcb333e6e099d66f2db20f898ca9461d5bf1c4c65acebc0bf69a814", [:mix], [{:connection, "~> 1.1", [hex: :connection, repo: "hexpm", optional: false]}, {:crc32cer, "~> 0.1", [hex: :crc32cer, repo: "hexpm", optional: false]}, {:varint, "~> 1.2", [hex: :varint, repo: "hexpm", optional: false]}], "hexpm", "b2dcf44024fef1bcf02419b55bb78ac18a9bffca2bdd25d2b1941709b567155a"},
   "makeup": {:hex, :makeup, "1.2.1", "e90ac1c65589ef354378def3ba19d401e739ee7ee06fb47f94c687016e3713d1", [:mix], [{:nimble_parsec, "~> 1.4", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "d36484867b0bae0fea568d10131197a4c2e47056a6fbe84922bf6ba71c8d17ce"},
   "makeup_elixir": {:hex, :makeup_elixir, "1.0.1", "e928a4f984e795e41e3abd27bfc09f51db16ab8ba1aebdba2b3a575437efafc2", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "7284900d412a3e5cfd97fdaed4f5ed389b8f2b4cb49efc0eb3bd10e2febf9507"},