fix(nyz): fix confusing shallow copy operation bug about next_obs

[PaParaZz1]

Description

fix confusing shallow copy operation bug about next_obs

Related Issue

#638

TODO

Check List

• merge the latest version source branch/repo, and resolve all the conflicts
• pass style check
• pass all the tests

[codecov]

Codecov Report

Merging #641 (ad6ab70) into main (1cb1038) will decrease coverage by 0.27%.
The diff coverage is 95.23%.

@@            Coverage Diff             @@
##             main     #641      +/-   ##
==========================================
- Coverage   82.64%   82.38%   -0.27%     
==========================================
  Files         578      579       +1     
  Lines       47266    46763     -503     
==========================================
- Hits        39063    38525     -538     
- Misses       8203     8238      +35     

Flag	Coverage Δ
unittests	82.38% <95.23%> (-0.27%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...orker/collector/battle_episode_serial_collector.py	14.19% <0.00%> (ø)
...worker/collector/battle_sample_serial_collector.py	13.37% <0.00%> (ø)
ding/worker/collector/base_serial_collector.py	90.36% <100.00%> (+0.23%)	⬆️
ding/worker/collector/episode_serial_collector.py	96.17% <100.00%> (ø)
ding/worker/collector/sample_serial_collector.py	91.41% <100.00%> (ø)
...rker/collector/tests/test_base_serial_collector.py	100.00% <100.00%> (ø)

... and 223 files with indirect coverage changes

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