Update Polkadot stable2506

[zjb0807]

• Update Polkadot stable2506
• Update ReserveProvider of xtokens pallet

nutsfinance/stable-asset#59

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 61.91%. Comparing base (8f0893a) to head (d221512).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
modules/xcm-interface/src/lib.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2917      +/-   ##
==========================================
+ Coverage   61.90%   61.91%   +0.01%     
==========================================
  Files          69       69              
  Lines        9469     9469              
==========================================
+ Hits         5862     5863       +1     
+ Misses       3607     3606       -1     

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