Fix stream_manager_test type warnings

[verult]

No description provided.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (8e4e7d1) 97.88% compared to head (eff7c77) 97.88%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6299   +/-   ##
=======================================
  Coverage   97.88%   97.88%           
=======================================
  Files        1104     1104           
  Lines       95863    95869    +6     
=======================================
+ Hits        93840    93846    +6     
  Misses       2023     2023           

Files	Coverage Δ
cirq-ft/cirq_ft/algos/and_gate.py	100.00% <100.00%> (ø)
cirq-ft/cirq_ft/algos/apply_gate_to_lth_target.py	100.00% <100.00%> (ø)
...-ft/cirq_ft/algos/prepare_uniform_superposition.py	100.00% <100.00%> (ø)
cirq-ft/cirq_ft/algos/qrom.py	100.00% <100.00%> (ø)
cirq-ft/cirq_ft/algos/selected_majorana_fermion.py	100.00% <100.00%> (ø)
cirq-ft/cirq_ft/algos/state_preparation.py	100.00% <100.00%> (ø)
cirq-ft/cirq_ft/infra/gate_with_registers.py	96.32% <100.00%> (+0.11%)	⬆️
cirq-ft/cirq_ft/infra/gate_with_registers_test.py	100.00% <100.00%> (ø)
...q-google/cirq_google/engine/stream_manager_test.py	100.00% <100.00%> (ø)

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