CompatHelper: bump compat for "FiniteDifferences" to "0.12" for package test (#1520)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

test/Project.toml

@@ -38,7 +38,7 @@ Distributions = "0.23.8, 0.24"
 DistributionsAD = "0.6.3"
 DynamicHMC = "2.1.6"
 DynamicPPL = "0.10.2"
-FiniteDifferences = "0.10.8, 0.11"
+FiniteDifferences = "0.10.8, 0.11, 0.12"
 ForwardDiff = "0.10.12"
 MCMCChains = "4.0.4"
 Memoization = "0.1.4"