fix: fixed upserting events using insert_many

[ErikBjare]

Should fix the remaining issue in ActivityWatch/activitywatch#615

[codecov]

Codecov Report

Merging #108 (1198fbf) into master (5dbb610) will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
+ Coverage   90.79%   90.88%   +0.08%     
==========================================
  Files          34       34              
  Lines        1662     1678      +16     
  Branches      257      267      +10     
==========================================
+ Hits         1509     1525      +16     
  Misses        118      118              
  Partials       35       35              

Impacted Files	Coverage Δ
aw_datastore/storages/memory.py	94.28% <100.00%> (+0.84%)	⬆️
aw_datastore/storages/peewee.py	99.31% <100.00%> (+0.01%)	⬆️
aw_datastore/storages/sqlite.py	96.71% <100.00%> (+0.08%)	⬆️

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