ci/run_github_autoreply.sh: fix pip3 compatibility issue

Some versions of pip3 do not support the
"--break-system-packages" option.
Updated the script to handle both cases
gracefully and ensure broader compatibility

Signed-off-by: Arthur She <arthur.she@linaro.org>
Change-Id: I625b847531e452a21b3520a788448dcc31a1995a
1 file changed