remove extra User-Agent

[splch]

changes from User-Agent: User-Agent: cirq/1.2.0 (python/3.11.4) to User-Agent: cirq/1.2.0 (python/3.11.4)

[vtomole]

LGTM. Linter is flagging the unused import anyway.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01% ⚠️

Comparison is base (6e38a27) 97.60% compared to head (18b3357) 97.60%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6232      +/-   ##
==========================================
- Coverage   97.60%   97.60%   -0.01%     
==========================================
  Files        1116     1116              
  Lines       95772    95768       -4     
==========================================
- Hits        93481    93476       -5     
- Misses       2291     2292       +1     

Files Changed	Coverage Δ
cirq-core/cirq/protocols/json_serialization.py	97.68% <ø> (ø)
cirq-ionq/cirq_ionq/ionq_devices_test.py	100.00% <ø> (ø)
cirq-core/cirq/vis/heatmap_test.py	98.00% <100.00%> (-0.02%)	⬇️
cirq-ionq/cirq_ionq/ionq_client.py	100.00% <100.00%> (ø)
cirq-ionq/cirq_ionq/ionq_client_test.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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