CI: Increase functional test timeout

The mutex functional test requires more time to complete and print
PASS criteria with the original timing parameters. Instead of modifying
app/mutex.c, increase the timeout to accommodate the test execution time.

Author: jserv

.ci/run-functional-tests.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # Configuration
-TIMEOUT=5
+TIMEOUT=10
 TOOLCHAIN_TYPE=${TOOLCHAIN_TYPE:-gnu}
 
 # Define functional tests and their expected PASS criteria