Relax pybind11 version requirement for package managers

[EZoni]

Overview

Fix the issue raised in BLAST-ImpactX/impactx#1419 (comment):

@EZoni I overlooked something here: You do not want to update the version in find_package higher than needed, because that way we cannot build with version 3.0.0, 3.0.1, 3.0.2, and 3.0.3 in package managers anymore - even if those versions are totally fine. (e.g., conda-forge is still to ship 3.0.4, stands at 3.0.3. Spack has very good version control, too). So in other words: keep this here on 3.0.0 and below just update the version we download to the latest.

Related PRs

• Relax pybind11 version requirement for package managers BLAST-ImpactX/impactx#1432
• Relax pybind11 version requirement for package managers AMReX-Codes/pyamrex#565

Notes

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