chore(deps-dev): bump tz in the dev-dependencies group (#769)

Bumps the dev-dependencies group with 1 update: [tz](https://github.com/mathieuprog/tz).


Updates `tz` from 0.28.1 to 0.28.2
- [Release notes](https://github.com/mathieuprog/tz/releases)
- [Changelog](https://github.com/mathieuprog/tz/blob/master/CHANGELOG.md)
- [Commits](mathieuprog/tz@v0.28.1...v0.28.2)

---
updated-dependencies:
- dependency-name: tz
  dependency-version: 0.28.2
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dev-dependencies
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

mix.lock

@@ -56,7 +56,7 @@
   "telemetry": {:hex, :telemetry, "1.4.2", "a0cb522801dffb1c49fe6e30561badffc7b6d0e180db1300df759faa22062855", [:rebar3], [], "hexpm", "928f6495066506077862c0d1646609eed891a4326bee3126ba54b60af61febb1"},
   "text_diff": {:hex, :text_diff, "0.1.0", "1caf3175e11a53a9a139bc9339bd607c47b9e376b073d4571c031913317fecaa", [:mix], [], "hexpm", "d1ffaaecab338e49357b6daa82e435f877e0649041ace7755583a0ea3362dbd7"},
   "typed_struct": {:hex, :typed_struct, "0.3.0", "939789e3c1dca39d7170c87f729127469d1315dcf99fee8e152bb774b17e7ff7", [:mix], [], "hexpm", "c50bd5c3a61fe4e198a8504f939be3d3c85903b382bde4865579bc23111d1b6d"},
-  "tz": {:hex, :tz, "0.28.1", "717f5ffddfd1e475e2a233e221dc0b4b76c35c4b3650b060c8e3ba29dd6632e9", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:mint, "~> 1.6", [hex: :mint, repo: "hexpm", optional: true]}], "hexpm", "bfdca1aa1902643c6c43b77c1fb0cb3d744fd2f09a8a98405468afdee0848c8a"},
+  "tz": {:hex, :tz, "0.28.2", "6c47f3d1a8ee5c33a1d8f0ba49e5a851b0a30c408a587d907aff6e71228b3b32", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:mint, "~> 1.6", [hex: :mint, repo: "hexpm", optional: true]}], "hexpm", "a6bf7355a33f0a7511602ab4566432ac0901d8abff81e94e455bca19708a0c87"},
   "yamerl": {:hex, :yamerl, "0.10.0", "4ff81fee2f1f6a46f1700c0d880b24d193ddb74bd14ef42cb0bcf46e81ef2f8e", [:rebar3], [], "hexpm", "346adb2963f1051dc837a2364e4acf6eb7d80097c0f53cbdc3046ec8ec4b4e6e"},
   "yaml_elixir": {:hex, :yaml_elixir, "2.12.1", "d74f2d82294651b58dac849c45a82aaea639766797359baff834b64439f6b3f4", [:mix], [{:yamerl, "~> 0.10", [hex: :yamerl, repo: "hexpm", optional: false]}], "hexpm", "d9ac16563c737d55f9bfeed7627489156b91268a3a21cd55c54eb2e335207fed"},
   "ymlr": {:hex, :ymlr, "5.1.5", "0b9207c7940be3f2bc29b77cd55109d5aa2f4dcde6575942017335769e6f5628", [:mix], [], "hexpm", "7030cb240c46850caeb3b01be745307632be319b15f03083136f6251f49b516d"},