CompatHelper: bump compat for Bijectors to 0.15, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Bijectors package from 0.14 to 0.14, 0.15.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.41%. Comparing base (f4beee9) to head (f14cf53).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2399   +/-   ##
=======================================
  Coverage   86.41%   86.41%           
=======================================
  Files          22       22           
  Lines        1575     1575           
=======================================
  Hits         1361     1361           
  Misses        214      214           

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[coveralls]

Pull Request Test Coverage Report for Build 12082860539

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 122 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-7.8%) to 78.585%

---

Files with Coverage Reduction	New Missed Lines	%
src/mcmc/hmc.jl	122	0.0%

Totals
Change from base Build 12053229696:	-7.8%
Covered Lines:	1233
Relevant Lines:	1569

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💛 - Coveralls