Update CodecXz requirement to 0.7.4 in /docs

Updates the requirements on [CodecXz](https://github.com/JuliaIO/CodecXz.jl) to permit the latest version.
- [Release notes](https://github.com/JuliaIO/CodecXz.jl/releases)
- [Commits](JuliaIO/CodecXz.jl@v0.1.0...v0.7.4)

---
updated-dependencies:
- dependency-name: CodecXz
  dependency-version: 0.7.4
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

docs/Project.toml

@@ -13,4 +13,5 @@ StatsPlots = "f3b207a7-027a-5e70-b257-86293d7955fd"
 Suppressor = "fd094767-a336-5f1f-9728-57cf17d0bbfb"
 
 [compat]
+CodecXz = "0.7.4"
 Documenter = "1.16.1"