update ethyl

Author: darcys22

.gitmodules

@@ -3,7 +3,7 @@
        url = https://github.com/catchorg/Catch2
 [submodule "test/cpp/external/ethyl"]
        path = test/cpp/external/ethyl
-       url = https://github.com/oxen-io/ethyl.git
+       url = https://github.com/session-foundation/ethyl.git
 [submodule "test/cpp/external/bls"]
        path = test/cpp/external/bls
        url = https://github.com/oxen-io/bls.git