Switch to use https://github.com/tarantool/libslave.git

Author: rtsisyk

.gitmodules

@@ -3,8 +3,7 @@
 	url = https://github.com/tarantool/tarantool-c.git
 [submodule "lib/libslave"]
 	path = lib/libslave
-	url = [email protected]:cpp/libslave.git
-	branch = mamba
+	url = https://github.com/tarantool/libslave.git
 [submodule "lib/yaml-cpp"]
 	path = lib/yaml-cpp
-	url = https://github.com/jbeder/yaml-cpp.git
+	url = https://github.com/tarantool/yaml-cpp.git