Bump tailwind_formatter from 0.3.7 to 0.4.0 in /demo

Bumps [tailwind_formatter](https://github.com/100phlecs/tailwind_formatter) from 0.3.7 to 0.4.0.
- [Release notes](https://github.com/100phlecs/tailwind_formatter/releases)
- [Changelog](https://github.com/100phlecs/tailwind_formatter/blob/master/CHANGELOG.md)
- [Commits](100phlecs/tailwind_formatter@v0.3.7...v0.4.0)

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

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

demo/mix.exs

@@ -65,7 +65,7 @@ defmodule Demo.MixProject do
       {:phoenix_swoosh, "~> 1.0"},
       {:gen_smtp, "~> 1.1"},
       {:backpex, path: "../."},
-      {:tailwind_formatter, "~> 0.3.2", only: [:dev, :test], runtime: false},
+      {:tailwind_formatter, "~> 0.4.0", only: [:dev, :test], runtime: false},
       {:csv, "~> 3.2.0"},
       {:tesla, "~> 1.4"},
       {:jason, ">= 1.0.0"}

demo/mix.lock

@@ -62,7 +62,7 @@
   "swoosh": {:hex, :swoosh, "1.14.2", "cf686f92ad3b21e6651b20c50eeb1781f581dc7097ef6251b4d322a9f1d19339", [:mix], [{:cowboy, "~> 1.1 or ~> 2.4", [hex: :cowboy, repo: "hexpm", optional: true]}, {:ex_aws, "~> 2.1", [hex: :ex_aws, repo: "hexpm", optional: true]}, {:finch, "~> 0.6", [hex: :finch, repo: "hexpm", optional: true]}, {:gen_smtp, "~> 0.13 or ~> 1.0", [hex: :gen_smtp, repo: "hexpm", optional: true]}, {:hackney, "~> 1.9", [hex: :hackney, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}, {:mail, "~> 0.2", [hex: :mail, repo: "hexpm", optional: true]}, {:mime, "~> 1.1 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:plug, "~> 1.9", [hex: :plug, repo: "hexpm", optional: true]}, {:plug_cowboy, ">= 1.0.0", [hex: :plug_cowboy, repo: "hexpm", optional: true]}, {:req, "~> 0.4 or ~> 1.0", [hex: :req, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4.2 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "01d8fae72930a0b5c1bb9725df0408602ed8c5c3d59dc6e7a39c57b723cd1065"},
   "table_rex": {:hex, :table_rex, "3.1.1", "0c67164d1714b5e806d5067c1e96ff098ba7ae79413cc075973e17c38a587caa", [:mix], [], "hexpm", "678a23aba4d670419c23c17790f9dcd635a4a89022040df7d5d772cb21012490"},
   "tailwind": {:hex, :tailwind, "0.2.2", "9e27288b568ede1d88517e8c61259bc214a12d7eed271e102db4c93fcca9b2cd", [:mix], [{:castore, ">= 0.0.0", [hex: :castore, repo: "hexpm", optional: false]}], "hexpm", "ccfb5025179ea307f7f899d1bb3905cd0ac9f687ed77feebc8f67bdca78565c4"},
-  "tailwind_formatter": {:hex, :tailwind_formatter, "0.3.7", "2728d031e6803dfddf63f1dd7c64b5b9fd70ffdf635709c50f47589f4fb48861", [:mix], [{:phoenix_live_view, ">= 0.17.6", [hex: :phoenix_live_view, repo: "hexpm", optional: true]}], "hexpm", "3d91ac4d4622505b09c0f4678512281515b4fbe7644f012da1bd2722f5880185"},
+  "tailwind_formatter": {:hex, :tailwind_formatter, "0.4.0", "2aa6f391b3b6fe52a18fe75b75c76d541c3478a31bcfc1ebe987819fa32653bf", [:mix], [], "hexpm", "6465afc3e864937fcb477524be45a2d9d73a1b1ee904d85f1592b80dbcb0b741"},
   "telemetry": {:hex, :telemetry, "1.2.1", "68fdfe8d8f05a8428483a97d7aab2f268aaff24b49e0f599faa091f1d4e7f61c", [:rebar3], [], "hexpm", "dad9ce9d8effc621708f99eac538ef1cbe05d6a874dd741de2e689c47feafed5"},
   "telemetry_metrics": {:hex, :telemetry_metrics, "0.6.1", "315d9163a1d4660aedc3fee73f33f1d355dcc76c5c3ab3d59e76e3edf80eef1f", [:mix], [{:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "7be9e0871c41732c233be71e4be11b96e56177bf15dde64a8ac9ce72ac9834c6"},
   "telemetry_poller": {:hex, :telemetry_poller, "1.0.0", "db91bb424e07f2bb6e73926fcafbfcbcb295f0193e0a00e825e589a0a47e8453", [:rebar3], [{:telemetry, "~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "b3a24eafd66c3f42da30fc3ca7dda1e9d546c12250a2d60d7b81d264fbec4f6e"},