CompatHelper: bump compat for "Symbolics" to "1" (#81)

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

Author: github-actions[bot]

Project.toml

@@ -10,7 +10,7 @@ Symbolics = "0c5d862f-8b57-4792-8d23-62f2024744c7"
 [compat]
 IfElse = "0.1"
 ModelingToolkit = "5.16.0"
-Symbolics = "0.1.21"
+Symbolics = "0.1.21, 1"
 julia = "1.5"
 
 [extras]