fix: use https instead of ssh for submodules

Author: richard-ramos

.gitmodules

@@ -3,4 +3,4 @@
 	url = https://github.com/waku-org/waku-rln-contract.git
 [submodule "waku/v2/protocol/waku-proto"]
 	path = waku/v2/protocol/waku-proto
-	url = git@github.com:waku-org/waku-proto.git
+	url = https://github.com/waku-org/waku-proto