Flow: switched to exact object by default

[IvanGoncharov]

In preparation for TS migration

[codecov]

Codecov Report

Merging #351 (468ba53) into main (0b9c25a) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #351   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines          745       745           
  Branches        51        51           
=========================================
  Hits           745       745           

Impacted Files	Coverage Δ
src/__tests__/starWarsData.js	100.00% <ø> (ø)
src/connection/arrayConnection.js	100.00% <ø> (ø)
src/connection/connection.js	100.00% <ø> (ø)
src/mutation/mutation.js	100.00% <ø> (ø)
src/node/node.js	100.00% <ø> (ø)
src/node/plural.js	100.00% <ø> (ø)

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