ci: workaround msys2 pip brokenness by using the system meson
MSYS2 currently contains a Python 3 without openssl support which makes pip fail to install. Use the system meson (0.48) until it is fixed upstream.
MSYS2 currently contains a Python 3 without openssl support which makes pip fail to install. Use the system meson (0.48) until it is fixed upstream.