docs: set_versions.py: check for first latest release tag

Let's not maintain manually which tag should be locally available before
asking the user to run git fetch --tags. Instead, let's check for the
latest release first tag (e.g. for Kirkstone, 4.0 even though 4.0.1 is
already out).

Cc: Quentin Schulz <foss+yocto@0leil.net>
(From yocto-docs rev: 7466c0c37ac193fc3d089fadd426d8a802cd0650)

Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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