ENH: Fix some warning caused by deprecation

[hucorz]

What do these changes do?

• fix some warning in _mars/dataframe/indexing
• fix fillna's warning caused by method param

Related issue number

Fixes #xxxx

Check code requirements

• tests added / passed (if needed)
• Ensure all linting tests pass

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.98%. Comparing base (9984250) to head (e6bb347).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #804      +/-   ##
==========================================
+ Coverage   82.97%   82.98%   +0.01%     
==========================================
  Files        1070     1070              
  Lines       80004    80031      +27     
  Branches    16537    16528       -9     
==========================================
+ Hits        66380    66414      +34     
+ Misses      12031    12020      -11     
- Partials     1593     1597       +4     

Flag	Coverage Δ
unittests	82.89% <ø> (+0.01%)	⬆️

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[luweizheng]

LGTM