build: minimum CMake required changed to 3.30.5 for `test_package` to… #376

Job	Run time
Generate build matrix for Freestanding CI	4s
Clang-18 (x86-64) C++23 fmtlib none Release	1m 14s
Clang-18 (x86-64) C++23 std::format none Release	1m 14s
GCC-14 C++23 fmtlib none Debug	39s
GCC-14 C++23 fmtlib none Release	31s
GCC-14 C++23 std::format none Debug	34s
GCC-14 C++23 std::format none Release	1m 16s
	5m 32s

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