add explicit type

[xuwei-k]

prepare Scala 2.13.12

• Emit migration warnings under -Xsource:3 as fatal warnings, not errors; -Xmigration turns off erroring scala/scala#10439

[johnynek]

Thanks!

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.06% 🎉

Comparison is base (1b126ac) 95.06% compared to head (8af4df0) 95.13%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #537      +/-   ##
==========================================
+ Coverage   95.06%   95.13%   +0.06%     
==========================================
  Files          10       10              
  Lines        1480     1480              
  Branches      359      359              
==========================================
+ Hits         1407     1408       +1     
+ Misses         73       72       -1     

Files Changed	Coverage Δ
...shared/src/main/scala/cats/parse/Accumulator.scala	100.00% <ø> (+2.43%)	⬆️
core/shared/src/main/scala/cats/parse/Parser.scala	94.50% <100.00%> (ø)

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