Revert "python-requirements.txt: Bump the supported version of meson"
Revert "python-requirements.txt: Bump the supported version of meson"

This reverts commit 54da889ea56ce4e23182e4c42561bbeb6b0cd26a because it
causes all SW unit tests to be skipped in CI and freshly built
containers.

Fixes #6794

Signed-off-by: Alphan Ulusoy <23b245cc5a07aacf75a9db847b24c67dee1707bf@google.com>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan