Restrict Polyester.jl to v0.7.16

[ranocha]

Let's see whether this influences the failing threaded CI tests

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.95%. Comparing base (c422240) to head (6fe36b4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2408   +/-   ##
=======================================
  Coverage   96.95%   96.95%           
=======================================
  Files         504      504           
  Lines       41691    41721   +30     
=======================================
+ Hits        40418    40448   +30     
  Misses       1273     1273           

Flag	Coverage Δ
unittests	96.95% <ø> (+<0.01%)	⬆️

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[ranocha]

The remaining CI failures are again HTTP/2 429 errors:

• https://github.com/trixi-framework/Trixi.jl/actions/runs/15129275212/job/42527002792?pr=2408#step:7:5979
• https://github.com/trixi-framework/Trixi.jl/actions/runs/15129275229/job/42527002796?pr=2408#step:9:1357

and an error of the downgrade action:

ERROR: LoadError: range specifiers not supported
Stacktrace:
 [1] error(s::String)
   @ Base ./error.jl:35
 [2] downgrade(file::String, ignore_pkgs::Vector{SubString{String}}, strict::String)
   @ Main ~/work/_actions/julia-actions/julia-downgrade-compat/v1/downgrade.jl:26
 [3] top-level scope
   @ ~/work/_actions/julia-actions/julia-downgrade-compat/v1/downgrade.jl:77
in expression starting at /home/runner/work/_actions/julia-actions/julia-downgrade-compat/v1/downgrade.jl:71
Error: Process completed with exit code 1.

see https://github.com/trixi-framework/Trixi.jl/actions/runs/15129275219/job/42527002728?pr=2408#step:6:36

The only change of behavior in Polyester.jl comes from JuliaSIMD/Polyester.jl#154.
CC @efaulhaber

[ranocha]

Just a few rate limit errors. Let's see whether CI passes when running the two failing jobs again.

However, the threaded CI jobs all pass 🥳 Thus, we have at least figured out what caused the errors - but fixing them may be tedious....
CC @efaulhaber

[ranocha]

I will merge this right now without reviews to make CI work again. Please feel free to comment on it anyway.