Fix CI requirements for Changed files test

[pavoljuhas]

Problem: cirq-ft/cirq_ft/algos/qrom_test.py::test_notebook fails when
executed from Changed files test CI because of missing dependencies.

Solution: Install notebook-testing requirements for this CI job.

[pavoljuhas]

Note - Changed files test fails with

=========================== short test summary info ============================
FAILED cirq-ft/cirq_ft/algos/qrom_test.py::test_notebook - jupyter_client.kernelspec.NoSuchKernel: No such kernel named python3
============ 1 failed, 26 passed, 4435 warnings in 99.31s (0:01:39) ============
Error: Process completed with exit code 1.

[codecov]

Codecov Report

Patch coverage: 100.0% and no project coverage change.

Comparison is base (c193c48) 97.3% compared to head (e5034df) 97.3%.
Report is 3 commits behind head on master.

❗ Current head e5034df differs from pull request most recent head 9afc686. Consider uploading reports for the commit 9afc686 to get more accurate results

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #6243   +/-   ##
======================================
  Coverage    97.3%   97.3%           
======================================
  Files        1116    1116           
  Lines       96174   96076   -98     
======================================
- Hits        93654   93564   -90     
+ Misses       2520    2512    -8     

Files Changed	Coverage Δ
cirq-core/cirq/circuits/circuit_operation_test.py	100.0% <ø> (+0.1%)	⬆️
...ristic_decompositions/two_qubit_gate_tabulation.py	100.0% <ø> (ø)
cirq-ft/cirq_ft/algos/qrom_test.py	100.0% <ø> (ø)
cirq-google/cirq_google/engine/engine_client.py	100.0% <ø> (ø)
cirq-google/cirq_google/engine/engine_job_test.py	100.0% <ø> (ø)
examples/bernstein_vazirani.py	97.0% <ø> (-0.2%)	⬇️
examples/deutsch.py	96.0% <ø> (-0.6%)	⬇️
examples/shor.py	100.0% <ø> (+4.8%)	⬆️
cirq-google/cirq_google/engine/engine.py	98.1% <100.0%> (-0.1%)	⬇️
...rq-google/cirq_google/engine/engine_client_test.py	100.0% <100.0%> (ø)
... and 3 more

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[pavoljuhas]

Note the Changed files CI job passes after d17b4e4 - report