CompatHelper: bump compat for "Documenter" to "0.26" for package test (#241)

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

Author: github-actions[bot]

test/Project.toml

@@ -18,7 +18,7 @@ Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 [compat]
 AxisArrays = "0.4.3"
 Distances = "0.9, 0.10"
-Documenter = "0.25"
+Documenter = "0.25, 0.26"
 FiniteDifferences = "0.10.8, 0.11, 0.12"
 Flux = "0.10, 0.11"
 ForwardDiff = "0.10"