Revert "lib/pico-sdk: Fix Pico SDK fetching develop picotool."
This reverts commit cbc6aed8fa.
picotool 2.1.1 has a dependency to mbedtls whose CMakeLists.txt refers
to a horrendously old and nowadays unsupported version of cmake. This
breaks the build for our project, since we use cmake 4.0.0 at the time
of writing - and this version dropped support for cmake < 3.5.
This problem has been fixed in picotool 2.2.0 which, unfortunately, is
not yet available in micropython v1.26.0.
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