fix for pandas 1.2.0

[dilpath]

Small change in pandas, get_filepath_or_buffer -> _get_filepath_or_buffer (not sure if _get_filepath_or_buffer should be used in PEtab since it's now named like a private method).

https://github.com/pandas-dev/pandas/pull/37639

[codecov[bot]]

Codecov Report

Merging #493 (127a01c) into develop (4d6d917) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #493      +/-   ##
===========================================
+ Coverage    78.00%   78.03%   +0.02%     
===========================================
  Files           23       23              
  Lines         2301     2295       -6     
  Branches       548      544       -4     
===========================================
- Hits          1795     1791       -4     
+ Misses         370      369       -1     
+ Partials       136      135       -1     

Impacted Files	Coverage Δ
petab/sbml.py	57.35% <100.00%> (+0.51%)	:arrow_up:
petab/yaml.py	90.32% <100.00%> (-0.45%)	:arrow_down:

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[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication