CompatHelper: bump compat for "Zygote" to "0.6" for package test (#205)

This pull request changes the compat entry for the `Zygote` package from `0.5.4` to `0.5.4, 0.6` for package test.

This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry. It is your responsibility to make sure that your package tests pass before you merge this pull request.

Co-authored-by: David Widmann <[email protected]>

Author: github-actions[bot]

test/Project.toml

@@ -56,6 +56,6 @@ SpecialFunctions = "0.10.3, 1.0"
 StatsBase = "0.33"
 StatsFuns = "0.9.5"
 Tracker = "0.2.11"
-Zygote = "0.5.4"
+Zygote = "0.5.4, 0.6"
 ZygoteRules = "0.2"
 julia = "1.3"