fix: Fix warning due to unchecked cast.

[dpcollins-google]

No description provided.

[codecov]

Codecov Report

Merging #241 into master will increase coverage by 0.02%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##             master     #241      +/-   ##
============================================
+ Coverage     72.94%   72.96%   +0.02%     
- Complexity      750      755       +5     
============================================
  Files           135      135              
  Lines          3977     3995      +18     
  Branches        209      211       +2     
============================================
+ Hits           2901     2915      +14     
- Misses          953      956       +3     
- Partials        123      124       +1     

Impacted Files	Coverage Δ	Complexity Δ
.../google/cloud/pubsublite/ProjectBuilderHelper.java	66.66% <50.00%> (+6.66%)	2.00 <1.00> (ø)
...n/java/com/google/cloud/pubsublite/ErrorCodes.java	100.00% <0.00%> (ø)	3.00% <0.00%> (+1.00%)
...google/cloud/pubsublite/internal/ChannelCache.java	67.64% <0.00%> (+2.94%)	8.00% <0.00%> (+4.00%)

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