Add notice for PyPy users

[cecinestpasunepipe]

(DIS-3295)

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 75.51%. Comparing base (3822b47) to head (d8a712c).
Report is 1 commits behind head on main.

Files	Patch %	Lines
dissect/target/tools/shell.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #829   +/-   ##
=======================================
  Coverage   75.51%   75.51%           
=======================================
  Files         305      305           
  Lines       26343    26348    +5     
=======================================
+ Hits        19893    19897    +4     
- Misses       6450     6451    +1     

Flag	Coverage Δ
unittests	75.51% <80.00%> (+<0.01%)	⬆️

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[narimantos]

We wait until we they do a release? pypy/pypy#5006

[cecinestpasunepipe]

We wait until we they do a release? pypy/pypy#5006

Yes, let's give them some time to respond before we implement the notice.
If the manage to fix the issue we can probably do a version check as well, and urge our users to download the latest pypy.