CompatHelper: bump compat for MutableArithmetics to 1, (keep existing compat) (#13)

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

Author: github-actions[bot]

Project.toml

@@ -9,7 +9,7 @@ MutableArithmetics = "d8a4904e-b15c-11e9-3269-09a3773c0cb0"
 
 [compat]
 MultivariatePolynomials = "0.4"
-MutableArithmetics = "0.3"
+MutableArithmetics = "0.3, 1"
 julia = "1"
 
 [extras]