CompatHelper: bump compat for "Documenter" to "0.27" for package test (#266)

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

Author: github-actions[bot]

test/Project.toml

@@ -24,7 +24,7 @@ AbstractPPL = "0.1.3"
 Bijectors = "0.9.5"
 Distributions = "0.24, 0.25"
 DistributionsAD = "0.6.3"
-Documenter = "0.26.1"
+Documenter = "0.26.1, 0.27"
 ForwardDiff = "0.10.12"
 MCMCChains = "4.0.4"
 MacroTools = "0.5.5"