Bump pixelmatch from 5.3.0 to 6.0.0 in /cirq-web/cirq_ts #16162

Job	Run time
Format check	14s
Isolated pytest Ubuntu	8m 28s
Lint check	4m 19s
Changed files test	1m 7s
Doc test	2m 7s
Type check	1m 32s
Notebook formatting	15s
Pytest Ubuntu (3.10)	6m 41s
Packaging test	1m 23s
Pytest Ubuntu (3.11)	5m 46s
Pytest Ubuntu with NumPy-2 (3.10)	7m 25s
Pytest Ubuntu with NumPy-2 (3.11)	6m 38s
Pytest Ubuntu (3.12)	6m 15s
Misc check	9s
Pytest Ubuntu with NumPy-2 (3.12)	7m 33s
Shell check	11s
Build protos	17s
Coverage check	11m 3s
Notebook Tests against PR	10m 21s
Pytest MacOS (3.10)	8m 27s
Pytest MacOS (3.11)	9m 54s
Changed Notebooks Isolated Test against Cirq stable (partition-0)	52s
Pytest MacOS (3.12)	15m 27s
Changed Notebooks Isolated Test against Cirq stable (partition-1)	57s
Changed Notebooks Isolated Test against Cirq stable (partition-2)	52s
Changed Notebooks Isolated Test against Cirq stable (partition-3)	50s
Check consistency of requirements	25s
Typescript tests coverage	38s
Bundle file consistency	49s
Typescript lint check	39s
Pytest Windows (3.10)	10m 58s
Typescript tests	37s
Pytest Windows (3.11)	10m 43s
Pytest Windows (3.12)	9m 45s
	2h 33m 37s

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