requirements: move Ubuntu-20.04 into unsupported category due to python

Bitbake commit 0d2e682d00df ("bitbake: lib/bb: Bump minimum python
version requirement to 3.9" -- poky commit 67566c7410e1) means that
Ubuntu 20.04 is no longer supported out-of-the-box as detailed further
in the respective commit log.

While it is true that it can still be used with buildtools, that can
also be said for nearly every other unsupported distro out there,
including Ubuntu 18.04 that we listed as unsupported some years ago.
Hence continuing to list it as supported with the new python requirement
in place does not make sense.

So we move it alongside of the 18.04 entry, into the "possibly tested,
but you get what you get" category.  And add an explicit mention of the
buildtools, so people have a thread to pull on.

(From yocto-docs rev: b1c09003dc304b1e65044f343fb341aaed58e6f3)

Signed-off-by: Paul Gortmaker <paulg@kernel.org>
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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