port: fix -Wdeprecated-declarations warning about sprintf on macOS clang 14

port: fix -Wdeprecated-declarations warning about sprintf on macOS clang 14

Remove uses of sprintf to fix this warning:

    warning: 'sprintf' is deprecated: This function is provided for
    compatibility reasons only.  Due to security concerns inherent in the
    design of sprintf(3), it is highly recommended that you use snprintf(3)
    instead. [-Wdeprecated-declarations]

Change-Id: I69dff6379623aefcfd60d6ad1ad96b48ae637155
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/9592
Tested-by: jenkins <jenkins@lttng.org>