bump rust-1.88.0

[zjb0807]

paritytech/srtool#95

https://github.com/paritytech/polkadot-sdk/pull/8592/files#diff-89f81085a6bcb4b9055f6fbb4e5e9ac5c541567aa95408d71c3c2a45a0c9c88dR543

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.67%. Comparing base (1aa875c) to head (09e2b28).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
asset-registry/src/impls.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1029      +/-   ##
==========================================
+ Coverage   65.53%   65.67%   +0.14%     
==========================================
  Files          49       49              
  Lines        3717     3715       -2     
==========================================
+ Hits         2436     2440       +4     
+ Misses       1281     1275       -6     

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