build: bump MultivariatePolynomials compat

Author: AayushSabharwal

Project.toml

@@ -12,7 +12,7 @@ Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [compat]
-MultivariatePolynomials = "0.5.9"
+MultivariatePolynomials = "0.5.12"
 MutableArithmetics = "1.6.5"
 Reexport = "1"
 julia = "1"