python-pip: update to 26.0.1

python-pip: update to 26.0.1

Refresh all patches for pip 26.0.1:
- 001 (pyproject-hooks-pyc-fix): vendored pyproject_hooks switched
  from single to double quotes and multiline block format; restructure
  to minimal diff (keep unchanged context lines as context)
- 002 (pip-runner-pyc-fix): get_runnable_pip() shifted ~20 lines;
  Set[str] -> set[str] in trailing context; refresh offsets
- 003 (disable-pip-version-check): option definition moved ~174 lines;
  refresh line number

pip 26 also dropped the version-specific binary (e.g. pip3.14).
Update the install rule to use pip3 as the primary binary and
symlink pip/pip$(VERSION) to it.

Signed-off-by: Alexandru Ardelean <redacted>