oeqa/selftest/recipetool: downgrade meson version to not use pyproject.toml

oeqa/selftest/recipetool: downgrade meson version to not use pyproject.toml

recipetool's pyproject.toml parsing needs tomllib (python 3.11+) or
tomli (not a hard dependency), so is prone to failing depending on the
host configuration.

Downgrade the Meson release used for the checks to 0.52.1, which was the
last release before moving to pyproject.toml.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>