CompatHelper: bump compat for DiffEqCallbacks to 3 for package core, …

…(keep existing compat) (#1173)

This pull request changes the compat entry for the `DiffEqCallbacks`
package from `2.29.1` to `2.29.1, 3` for package core.
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: CompatHelper Julia <[email protected]>

core/Project.toml

@@ -55,7 +55,7 @@ DataInterpolations = "4.4"
 DataStructures = "0.18"
 Dates = "<0.0.1,1"
 Dictionaries = "0.3.25, 0.4"
-DiffEqCallbacks = "2.29.1"
+DiffEqCallbacks = "2.29.1, 3"
 Documenter = "0.27,1"
 EnumX = "1.0"
 FiniteDiff = "2.21"