fix: Update demos #29

Job	Run time
cppcheck	46s
pre-commit	8s
macos-mamba	4m 19s
linux-mamba (gcc-9, gcc, gcc-9 g++-9, gcc-9, g++-9)	5m 19s
linux-mamba (gcc-10, gcc, gcc-10 g++-10, gcc-10, g++-10)	5m 40s
linux-mamba (gcc-11, gcc, gcc-11 g++-11, gcc-11, g++-11)	5m 32s
linux-mamba (gcc-12, gcc, gcc-12 g++-12, gcc-12, g++-12)	6m 41s
linux-mamba (clang-11, clang, clang-11, clang-11, clang++-11)	6m 59s
linux-mamba (clang-12, clang, clang-12, clang-12, clang++-12)	6m 54s
linux-mamba (clang-13, clang, clang-13, clang-13, clang++-13)	6m 33s
linux-mamba (clang-14, clang, clang-14, clang-14, clang++-14)	6m 16s
linux-mamba (clang-15, clang, clang-15, clang-15, clang++-15)	6m 10s
	1h 1m 17s

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