sip: Upgrade 6.8.3 -> 6.8.6styhead-nextstyhead

After the migration from Mercurial to GitHub the homepage has
changed and SIP has been licensed under the BSD-2-Clause license
since Feb 9, 2024. Upgrade to version 6.8.6:

- Handle single number macOS deployment targets
- Support for architectures where `char` is unsigned
- Support for building from git archives
- Run the tests using the current Python version

The project has a proper pyproject.toml which declares the
setuptools.build.meta PEP-517 backend.

Fixes:
WARNING: sip-6.8.6-r0 do_check_backend: QA Issue: inherits
setuptools3 but has pyproject.toml with setuptools.build_meta,
use the correct class [pep517-backend]

Please note SIP version 6.8.6 is present for branch Scarthgap and
it is required for PyQt6 6.8 from layer meta-qt6 (branch 6.8).

The work was sponsored by GOVCERT.LU.

License-Update: SIP is licensed under the BSD-2-Clause license.

Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

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