CompatHelper: bump compat for DocStringExtensions to 0.9, (keep existing compat)

Author: CompatHelper Julia

Project.toml

@@ -15,7 +15,7 @@ Symbolics = "0c5d862f-8b57-4792-8d23-62f2024744c7"
 TSVD = "9449cd9e-2762-5aa3-a617-5413e99d722e"
 
 [compat]
-DocStringExtensions = "0.8"
+DocStringExtensions = "0.8, 0.9"
 ModelingToolkit = "8.21"
 RandomizedLinAlg = "0.1"
 Setfield = "0.8, 1"