CompatHelper: bump compat for AbstractGPs to 0.5, (keep existing compat) (#214)

Co-authored-by: CompatHelper Julia <[email protected]>

Author: github-actions[bot]

Project.toml

@@ -1,6 +1,6 @@
 name = "Stheno"
 uuid = "8188c328-b5d6-583d-959b-9690869a5511"
-version = "0.7.14"
+version = "0.7.15"
 
 [deps]
 AbstractGPs = "99985d1d-32ba-4be9-9821-2ec096f28918"
@@ -17,7 +17,7 @@ Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 ZygoteRules = "700de1a5-db45-46bc-99cf-38207098b444"
 
 [compat]
-AbstractGPs = "0.4"
+AbstractGPs = "0.4, 0.5"
 BlockArrays = "0.15, 0.16"
 ChainRulesCore = "1"
 FillArrays = "0.7, 0.8, 0.9, 0.10, 0.11, 0.12"