conf: use bitbake 1.48 branch for intersphinx

We now publish the branch 1.48 of bitbake docs to
https://docs.yoctoproject.org/bitbake/1.48/

yocto-docs can refer to bitbake documentation using the intersphinx
extension. The gatesgarth docs should refer to the 1.48 branch of
bitbake, not the development branch.

(From yocto-docs rev: 09ae216a022b85fe1f03b55e6341e258c7215e20)

Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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