revert: Remove disallow of TensorFlow v2.14.0

[matthewfeickert]

Description

• With the release of tensorflow-probability v0.22.0, tensorflow v2.14.0 can be used and is required for tensorflow-probability v0.22.0+.
  • c.f. https://github.com/tensorflow/probability/releases/tag/v0.22.0
• Reverts PR build: Disallow TensorFlow v2.14.0 #2342

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* With the release of tensorflow-probability v0.22.0, tensorflow v2.14.0
  can be used and is required for tensorflow-probability v0.22.0+.
   - c.f. https://github.com/tensorflow/probability/releases/tag/v0.22.0
* Reverts PR https://github.com/scikit-hep/pyhf/pull/2342

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (f280cb2) 98.28% compared to head (1645a13) 98.28%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2344   +/-   ##
=======================================
  Coverage   98.28%   98.28%           
=======================================
  Files          69       69           
  Lines        4538     4538           
  Branches      803      803           
=======================================
  Hits         4460     4460           
  Misses         45       45           
  Partials       33       33           

Flag	Coverage Δ
contrib	97.86% <ø> (ø)
doctest	60.99% <ø> (ø)
unittests-3.10	96.29% <ø> (ø)
unittests-3.11	96.29% <ø> (ø)
unittests-3.8	96.31% <ø> (ø)
unittests-3.9	96.34% <ø> (ø)

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