gh-123067: Fix quadratic complexity in parsing cookies with backslashes #122844

Job	Run time
Change detection / Compute changed files	13s
Check if generated files are up to date	5m 0s
Address sanitizer	8m 26s
Ubuntu SSL tests with OpenSSL (1.1.1w)	1m 54s
Windows MSI${{ '' }}	0s
Ubuntu SSL tests with OpenSSL (3.0.13)	2m 13s
Hypothesis tests on Ubuntu	5m 21s
CIFuzz	0s
Ubuntu SSL tests with OpenSSL (3.1.5)	2m 13s
Ubuntu SSL tests with OpenSSL (3.2.1)	2m 25s
Thread sanitizer / Thread sanitizer	4m 27s
Thread sanitizer (free-threading) / Thread sanitizer	7m 43s
WASI / build and test	6m 7s
Windows / build (arm64)	2m 55s
Windows (free-threading) / build (arm64)	2m 56s
Windows / build and test (Win32)	15m 52s
Windows (free-threading) / build and test (Win32)	23m 50s
Windows / build and test (x64)	14m 40s
Windows (free-threading) / build and test (x64)	23m 5s
macOS (free-threading) / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	6m 5s
macOS / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	5m 13s
macOS / build and test (macos-13)	8m 40s
Ubuntu / build and test	7m 22s
Ubuntu (free-threading) / build and test	8m 58s
Docs / Docs	1m 54s
Docs / Docs (Oldest Sphinx)	1m 48s
Docs / Doctest	15m 27s
All required checks pass	4s
	3h 4m 51s

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