fix: Assorted warnings.

[dpcollins-google]

No description provided.

[codecov]

Codecov Report

Merging #246 into master will decrease coverage by 0.05%.
The diff coverage is 71.42%.

@@             Coverage Diff              @@
##             master     #246      +/-   ##
============================================
- Coverage     72.96%   72.91%   -0.06%     
  Complexity      755      755              
============================================
  Files           135      135              
  Lines          3995     3995              
  Branches        211      211              
============================================
- Hits           2915     2913       -2     
- Misses          956      958       +2     
  Partials        124      124              

Impacted Files	Coverage Δ	Complexity Δ
...om/google/cloud/pubsublite/ProjectLookupUtils.java	21.42% <33.33%> (-9.35%)	4.00 <3.00> (ø)
...gle/cloud/pubsublite/internal/AdminClientImpl.java	88.88% <83.33%> (-0.11%)	24.00 <1.00> (ø)
...loud/pubsublite/internal/TopicStatsClientImpl.java	70.00% <100.00%> (ø)	7.00 <0.00> (ø)
...loud/pubsublite/internal/wire/AssignerBuilder.java	82.60% <100.00%> (ø)	3.00 <0.00> (ø)
...oud/pubsublite/internal/wire/CommitterBuilder.java	73.33% <100.00%> (ø)	2.00 <0.00> (ø)
...oud/pubsublite/internal/wire/PublisherBuilder.java	86.36% <100.00%> (ø)	3.00 <0.00> (ø)
...loud/pubsublite/internal/wire/RoutingMetadata.java	81.81% <100.00%> (ø)	3.00 <0.00> (ø)
...ud/pubsublite/internal/wire/SubscriberBuilder.java	78.94% <100.00%> (ø)	2.00 <0.00> (ø)

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