fix unchecked casts

[pongad]

No description provided.

[codecov-io]

Codecov Report

Merging #265 into master will not change coverage.
The diff coverage is 50%.

@@            Coverage Diff            @@
##             master     #265   +/-   ##
=========================================
  Coverage     70.75%   70.75%           
  Complexity      546      546           
=========================================
  Files            79       79           
  Lines          2708     2708           
  Branches        274      274           
=========================================
  Hits           1916     1916           
  Misses          685      685           
  Partials        107      107

Impacted Files	Coverage Δ	Complexity Δ
...ava/com/google/api/gax/core/SettableApiFuture.java	100% <ø> (ø)	2 <0> (ø)	⬇️
...m/google/api/gax/grpc/DirectStreamingCallable.java	9.52% <0%> (ø)	1 <0> (ø)	⬇️
.../main/java/com/google/api/gax/core/ApiFutures.java	96.15% <100%> (ø)	7 <0> (ø)	⬇️

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