ci: Bump the llvmpipe test timeout to 240 seconds
lp_test_blend occasionally exceeds this on s390x, but we don't really want to lose what little (hah) big-endian coverage we have.
Related: #3437
lp_test_blend occasionally exceeds this on s390x, but we don't really want to lose what little (hah) big-endian coverage we have.
Related: #3437