use the generic linked list for the token store

[marten-seemann]

I'm not going to pretend that this code path is performance critical in any way, but it's nice to be consistent and use our generic linked list everywhere.

[codecov]

Codecov Report

Base: 85.49% // Head: 85.47% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (dbbd671) compared to base (d251219).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3654      +/-   ##
==========================================
- Coverage   85.49%   85.47%   -0.02%     
==========================================
  Files         142      140       -2     
  Lines       10303    10231      -72     
==========================================
- Hits         8808     8744      -64     
+ Misses       1110     1104       -6     
+ Partials      385      383       -2     

Impacted Files	Coverage Δ
token_store.go	100.00% <100.00%> (ø)
http3/server.go	72.95% <0.00%> (-1.22%)	⬇️
packet_handler_map.go	71.71% <0.00%> (-0.78%)	⬇️
config.go	100.00% <0.00%> (ø)
sys_conn_df_windows.go
sys_conn_windows.go

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