Fix RIOT CI job (#4962)

Use https instead of the unsupported git protocol.

JerryScript-DCO-1.0-Signed-off-by: Csaba Osztrogonác [email protected]

Author: ossy-szeged

targets/os/riot/Makefile.travis

@@ -27,7 +27,7 @@ install-apt-get-deps:
 
 # Fetch RIOT OS repository.
 install-clone-riot:
-	git clone git://github.com/RIOT-OS/RIOT.git ../RIOT -b 2021.10
+	git clone https://github.com/RIOT-OS/RIOT.git ../RIOT -b 2021.10
 
 # Perform all the necessary (JerryScript-independent) installation steps.
 install-noapt: install-clone-riot