gh-117151: IO performance improvement, increase io.DEFAULT_BUFFER_SIZE to 128k #127832

Job	Run time
Change detection / Compute changed files	15s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.0.15)	1m 18s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.1.7)	1m 2s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.2.3)	1m 5s
Check if generated files are up to date	1m 19s
Address sanitizer	1m 4s
Windows MSI${{ '' }}	0s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.3.2)	1m 6s
CIFuzz (address)	4m 18s
Hypothesis tests on Ubuntu	1m 29s
CIFuzz (undefined)	5m 4s
CIFuzz (memory)	4m 34s
Thread sanitizer / Thread sanitizer	1m 35s
Thread sanitizer (free-threading) / Thread sanitizer	1m 48s
WASI / build and test	50s
Windows / build (arm64)	3m 12s
Windows (free-threading) / build (arm64)	2m 31s
Windows / build and test (Win32)	15m 28s
macOS (free-threading) / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	58s
Windows (free-threading) / build and test (Win32)	23m 36s
Windows / build and test (x64)	15m 57s
Windows (free-threading) / build and test (x64)	22m 40s
macOS / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	1m 6s
macOS / build and test (macos-13)	2m 1s
Ubuntu / build and test (ubuntu-22.04)	1m 4s
Ubuntu (free-threading) / build and test (ubuntu-22.04)	1m 8s
Docs / Docs	2m 1s
Docs / Docs (Oldest Sphinx)	2m 3s
Docs / Doctest	1m 9s
All required checks pass	2s
	2h 1m 43s

Provide feedback