fix cxx standard for LAMMPS

[njzjz]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1379 (ebdff3b) into devel (5076263) will decrease coverage by 11.27%.
The diff coverage is n/a.

❗ Current head ebdff3b differs from pull request most recent head 51b657c. Consider uploading reports for the commit 51b657c to get more accurate results

@@             Coverage Diff             @@
##            devel    #1379       +/-   ##
===========================================
- Coverage   75.56%   64.28%   -11.28%     
===========================================
  Files          91        5       -86     
  Lines        7500       14     -7486     
===========================================
- Hits         5667        9     -5658     
+ Misses       1833        5     -1828     

Impacted Files	Coverage Δ
deepmd/descriptor/se_a_ebd.py
deepmd/infer/data_modifier.py
deepmd/loggers/loggers.py
deepmd/__init__.py
deepmd/model/tensor.py
deepmd/__main__.py
deepmd/descriptor/se_a_ef.py
deepmd/loss/__init__.py
source/op/_gelu.py
deepmd/descriptor/se.py
... and 76 more

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