getting the following error when trying to bootstrap the latest 2.16 dev release (dev5):

asher@ip-10-1-201-65 ~/projects/toolchain (pants2.16)$ ./pants generate-lockfiles
Bootstrapping Pants using /data/home/asher/.pyenv/versions/3.9.12/bin/python
Installing pantsbuild.pants==2.16.0.dev5 into a virtual environment at /data/home/asher/.cache/pants/setup/bootstrap-Linux-x86_64/2.16.0.dev5_py39
ERROR: Ignored the following versions that require a different python version: 2.12.0.dev2 Requires-Python ==3.7.*
ERROR: Could not find a version that satisfies the requirement pantsbuild.pants==2.16.0.dev5 (from versions: 0.0.17, 0.0.18, 0.0.20, 0.0.21, 0.0.22, 0.0.23, 0.0.24, 0.0.25, 0.0.26, 0.0.27, 0.0.28, 0.0.29, 0.0.30, 0.0.31, 0.0.32, 0.0.33, 0.0.34, 0.0.35, 0.0.36, 0.0.37, 0.0.38, 0.0.39, 0.0.40, 0.0.41, 0.0.42, 0.0.43, 0.0.44, 0.0.45, 0.0.46, 0.0.47, 0.0.48, 0.0.49, 0.0.50, 0.0.51, 0.0.52, 0.0.53, 0.0.54, 0.0.55, 0.0.56, 0.0.57, 0.0.58, 0.0.59, 0.0.60, 0.0.61, 0.0.62, 0.0.63, 0.0.64, 0.0.65, 0.0.66, 0.0.67, 0.0.68, 0.0.69, 0.0.70, 0.0.71, 0.0.72, 0.0.73, 0.0.74, 0.0.75, 0.0.76, 0.0.77, 0.0.79, 0.0.80, 0.0.81, 0.0.82, 1.0.0, 1.0.1, 1.1.0, 1.2.0, 1.2.1, 1.3.0, 1.4.0, 1.5.0, 1.6.0, 1.7.0, 1.15.0, 1.16.0, 1.17.0, 1.18.0, 1.19.0, 1.20.0, 1.21.0, 1.22.0, 1.23.0, 1.24.0, 1.25.0, 1.26.0, 1.27.0, 1.28.0, 2.5.0, 2.5.1rc5, 2.5.1rc6, 2.5.1, 2.5.2rc0, 2.5.2rc1, 2.5.2rc2, 2.5.2rc3, 2.5.2, 2.6.0rc0, 2.6.0rc1, 2.6.0rc2, 2.6.0rc3, 2.6.0rc4, 2.6.0, 2.6.1rc0, 2.6.1rc1, 2.6.1rc2, 2.6.1rc3, 2.6.1, 2.7.0rc0, 2.7.0rc1, 2.7.0rc2, 2.7.0rc3, 2.7.0rc4, 2.7.0rc5, 2.7.0, 2.7.1rc0, 2.7.1rc1, 2.7.1, 2.7.2rc0, 2.7.2rc1, 2.7.2rc2, 2.7.2, 2.8.0.dev5, 2.8.0rc0, 2.8.0rc1, 2.8.0rc2, 2.8.0rc3, 2.8.0rc4, 2.8.0rc5, 2.8.0rc6, 2.8.0, 2.8.1rc0, 2.8.1rc1, 2.8.1rc2, 2.8.1, 2.9.0.dev0, 2.9.0.dev1, 2.9.0.dev2, 2.9.0.dev3, 2.9.0.dev4, 2.9.0rc0, 2.9.0rc1, 2.9.0rc2, 2.9.0rc3, 2.9.0rc4, 2.9.0rc5, 2.9.0rc6, 2.9.0, 2.9.1rc0, 2.9.1rc1, 2.9.1rc2, 2.9.1, 2.9.2rc0, 2.9.2, 2.10.0.dev0, 2.10.0.dev1, 2.10.0.dev2, 2.10.0.dev3, 2.10.0rc0, 2.10.0rc1, 2.10.0rc2, 2.10.0rc3, 2.10.0rc4, 2.10.0rc5, 2.10.0, 2.10.1rc0, 2.10.1rc1, 2.10.1, 2.11.0.dev0, 2.11.0.dev1, 2.11.0.dev2, 2.11.0.dev3, 2.11.0rc0, 2.11.0rc1, 2.11.0rc2, 2.11.0rc3, 2.11.0rc4, 2.11.0rc5, 2.11.0rc6, 2.11.0, 2.11.1rc0, 2.11.1rc1, 2.11.1rc2, 2.11.1rc3, 2.11.1, 2.12.0.dev0, 2.12.0.dev1, 2.12.0.dev3, 2.12.0a0, 2.12.0rc0, 2.12.0rc1, 2.12.0rc2, 2.12.0rc3, 2.12.0, 2.12.1rc0, 2.12.1rc1, 2.12.1rc2, 2.12.1rc3, 2.12.1rc4, 2.12.1, 2.13.0.dev0, 2.13.0.dev1, 2.13.0.dev2, 2.13.0.dev3, 2.13.0.dev4, 2.13.0.dev5, 2.13.0a0, 2.13.0a1, 2.13.0rc0, 2.13.0rc1, 2.13.0rc2, 2.13.0rc3, 2.13.0, 2.13.1rc0, 2.13.1rc1, 2.13.1rc2, 2.13.1, 2.14.0.dev0, 2.14.0.dev1, 2.14.0.dev2, 2.14.0.dev3, 2.14.0.dev4, 2.14.0.dev5, 2.14.0.dev6, 2.14.0a0, 2.14.0a1, 2.14.0rc0, 2.14.0rc1, 2.14.0rc2, 2.14.0rc3, 2.14.0rc4, 2.14.0rc5, 2.14.0, 2.14.1rc0, 2.14.1, 2.15.0.dev0, 2.15.0.dev1, 2.15.0.dev2, 2.15.0.dev3, 2.15.0.dev4, 2.15.0.dev5, 2.15.0a0, 2.15.0a1, 2.15.0rc0, 2.15.0rc1, 2.16.0.dev0, 2.16.0.dev1, 2.16.0.dev2, 2.16.0.dev3, 2.16.0.dev4)
ERROR: No matching distribution found for pantsbuild.pants==2.16.0.dev5
asher@ip-10-1-201-65 ~/projects/toolchain (pants2.16)$ pyenv versions
  system
  3.6.10
  3.7.10
  3.8.2
  3.8.5
  3.8.6
  3.8.9
  3.8.12
  3.9.4
* 3.9.12 (set by /data/home/asher/.pyenv/version)

It's not been released.

ah... I just look at pypi 😉

Soon enough we'll yank that from you and it will be hermetic with just 1 complete pants.pex / scie per platform on GH Releases and your strategy will then be solid. For present it will not generally be.