using https for submodules

Author: MMarcus95

.gitmodules

@@ -1,15 +1,15 @@
 [submodule "dls2"]
 	path = dls2
-	url = git@github.com:iit-DLSLab/dls2.git
+	url = https://github.com/iit-DLSLab/dls2.git
 [submodule "robotlib"]
 	path = robotlib
-	url = git@github.com:iit-DLSLab/robotlib.git
+	url = https://github.com/iit-DLSLab/robotlib.git
 [submodule "dls2_ros2_interface"]
 	path = dls2_ros2_interface
-	url = git@github.com:iit-DLSLab/dls2_ros2_interface.git
+	url = https://github.com/iit-DLSLab/dls2_ros2_interface.git
 [submodule "dls2_msgs"]
 	path = dls2_msgs
-	url = git@github.com:iit-DLSLab/dls2_msgs.git
+	url = https://github.com/iit-DLSLab/dls2_msgs.git
 [submodule "pinocchio-gluecode"]
 	path = pinocchio-gluecode
-	url = git@github.com:iit-DLSLab/pinocchio-gluecode.git
+	url = https://github.com/iit-DLSLab/pinocchio-gluecode.git