Fix test environment with package extensions (#76)

* try to fix test environment

* remove package as dependency in test

Author: tristanmontoya

test/Project.toml

@@ -1,11 +1,15 @@
 [deps]
 NLsolve = "2774e3e8-f4cf-5e23-947b-6d7e65073b56"
 OrdinaryDiffEq = "1dea7af3-3e70-54e6-95c3-0bf5283fa5ed"
+OrdinaryDiffEqLowStorageRK = "b0944070-b475-4768-8dec-fb6eb410534d"
+OrdinaryDiffEqSSPRK = "669c94d9-1f4b-4b64-b377-1aa079aa2388"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 Trixi = "a7f1ee26-1774-49b1-8366-f1abc58fbfcb"
 
 [compat]
 NLsolve = "4.5.1"
-OrdinaryDiffEq = "6.53.2"
+OrdinaryDiffEq = "6.91"
+OrdinaryDiffEqLowStorageRK = "1.2"
+OrdinaryDiffEqSSPRK = "1.2"
 Test = "1"
 Trixi = "0.9.9, 0.10, 0.11"