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MINOR: [C++][CI] Bump ccache max size #9764

Job	Run time
check-labels / Check labels	5s
check-enabled	4s
ODBC Windows	6m 6s
JNI Windows	10m 32s
JNI ubuntu-24.04-arm arm64/v8	10m 16s
ODBC Linux	5m 49s
JNI ubuntu-latest amd64	11m 26s
AMD64 Ubuntu Large Memory Tests	41m 31s
JNI macOS	9m 19s
AMD64 Alpine Linux	9m 23s
AMD64 Ubuntu Meson	30m 31s
AMD64 Debian SIMD Level NONE	13m 28s
ODBC debug AMD64 macOS 15-intel	16m 21s
AMD64 Debian C++23	14m 35s
ODBC release ARM64 macOS 14	8m 11s
ODBC debug ARM64 macOS 14	11m 41s
ODBC release AMD64 macOS 15-intel	19m 37s
ARM64 Windows 11 MSVC / windows	21m 19s
ODBC nightly	0s
report-extra-cpp	-1s
	4h 0m 13s