fix logging of locally initiated key updates

[marten-seemann]

Local key updates were logged with the wrong phase (1 too little).

[codecov]

Codecov Report

Merging #2764 into master will increase coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2764      +/-   ##
==========================================
+ Coverage   86.52%   86.64%   +0.13%     
==========================================
  Files         128      128              
  Lines        9960    10009      +49     
==========================================
+ Hits         8617     8672      +55     
+ Misses       1010     1007       -3     
+ Partials      333      330       -3     

Impacted Files	Coverage Δ
internal/handshake/updatable_aead.go	94.53% <100.00%> (+3.19%)	⬆️
internal/ackhandler/sent_packet_history.go	100.00% <0.00%> (ø)
internal/ackhandler/sent_packet_handler.go	73.54% <0.00%> (+0.43%)	⬆️
qlog/event.go	96.53% <0.00%> (+0.45%)	⬆️
qlog/packet_header.go	96.36% <0.00%> (+1.49%)	⬆️

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