CompatHelper: bump compat for "FillArrays" to "0.12" (JuliaGaussianProcesses#330)

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

Author: github-actions[bot]

Project.toml

@@ -24,7 +24,7 @@ ChainRulesCore = "0.9.44, 0.10"
 Compat = "3.7"
 CompositionsBase = "0.1"
 Distances = "0.10"
-FillArrays = "0.10, 0.11"
+FillArrays = "0.10, 0.11, 0.12"
 Functors = "0.1, 0.2"
 Requires = "1.0.1"
 SpecialFunctions = "0.8, 0.9, 0.10, 1"