Update golang.org/x/exp/jsonrpc2 digest to a4bb9ff

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
golang.org/x/exp/jsonrpc2	require	digest	90e834f -> a4bb9ff

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.11%. Comparing base (bb76806) to head (aab5620).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2309      +/-   ##
==========================================
+ Coverage   53.61%   54.11%   +0.50%     
==========================================
  Files         239      239              
  Lines       30733    23265    -7468     
==========================================
- Hits        16477    12591    -3886     
+ Misses      13085     9498    -3587     
- Partials     1171     1176       +5     

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