Update changelog for v2.2.1

changelog: bump v2.2.0 release date

Update CHANGELOG.md - v2.1.0 bumped 1 day

update changelog for v2.1.0

Merge pull request #544 from PyFstat/pin-python-under-312

pin python<3.12 for now

update changelog for v2.0.1

Merge pull request #543 from PyFstat/pypi-publish-oidc

adapt integration.yml to using OIDC for PyPI

Merge pull request #535 from PyFstat/prepare-2.0.0

metadata updates for v2.0.0

Merge pull request #516 from PyFstat/pin-numpy-for-ptemcee

pin numpy<1.24.0

Merge pull request #510 from PyFstat/508-fix-ipg-examples

isotropic_amplitude_priors is not global anymore