Bump taiki-e/install-action from 2.67.30 to 2.68.8 in the github-actions group #900

Job	Run time
Build for 32-bit	36s
Build with make	5m 6s
macOS	48s
CMake 3.7.0 (min. required)	25s
Run static checkers	28s
Windows (Cygwin)	2m 38s
Windows (MinGW64)	1m 14s
Installation tests	36s
RDMA support enabled	18s
Windows	12m 4s
Build with CMake and undefined-sanitizer [clang-20, cmake-4.0, RelWithDebInfo]	3m 15s
Build with CMake and thread-sanitizer [clang-20, cmake-4.0, RelWithDebInfo]	3m 18s
Build with CMake and thread-sanitizer [gcc-14, cmake-4.0, RelWithDebInfo]	3m 38s
Build with CMake and address-sanitizer [clang-20, cmake-4.0, RelWithDebInfo]	3m 31s
Build with CMake and leak-sanitizer [clang-20, cmake-4.0, RelWithDebInfo]	3m 38s
Build with CMake and address-sanitizer [gcc-14, cmake-4.0, RelWithDebInfo]	3m 18s
Build with CMake [clang-14, cmake-3.13, Release]	4m 8s
Build with CMake [gcc-9, cmake-3.13, Release]	2m 57s
Build with CMake and undefined-sanitizer [gcc-14, cmake-4.0, RelWithDebInfo]	3m 14s
Build with CMake [clang-20, cmake-4.0, Release]	3m 2s
Build with CMake [gcc-14, cmake-4.0, Release]	3m 4s
Build with CMake and leak-sanitizer [gcc-14, cmake-4.0, RelWithDebInfo]	3m 12s
	1h 4m 28s

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