Updated Github Actions to checkout@v4 #546

Job	Run time
Syntax Check - Clang C++03 Linux No STL (ubuntu-22.04)	23s
Syntax Check - Clang C++11 Linux No STL (ubuntu-22.04)	36s
Syntax Check - Clang C++03 Linux STL (ubuntu-22.04)	25s
Syntax Check - Clang C++11 Linux No STL Force C++03 (ubuntu-22.04)	38s
Syntax Check - Clang C++11 Linux STL (ubuntu-22.04)	39s
Syntax Check - Clang C++11 Linux STL Force C++03 (ubuntu-22.04)	44s
Syntax Check - Clang C++14 Linux No STL (ubuntu-22.04)	38s
Syntax Check - Clang C++14 Linux No STL Force C++03 (ubuntu-22.04)	41s
Syntax Check - Clang C++14 Linux STL (ubuntu-22.04)	40s
Syntax Check - Clang C++14 Linux STL Force C++03 (ubuntu-22.04)	49s
Syntax Check - Clang C++17 Linux No STL (ubuntu-22.04)	43s
Syntax Check - Clang C++17 Linux No STL Force C++03 (ubuntu-22.04)	44s
Syntax Check - Clang C++17 Linux STL (ubuntu-22.04)	52s
Syntax Check - Clang C++17 Linux STL Force C++03 (ubuntu-22.04)	50s
Syntax Check - Clang C++20 Linux No STL (ubuntu-22.04)	1m 11s
Syntax Check - Clang C++20 Linux No STL Force C++03 (ubuntu-22.04)	1m 6s
Syntax Check - Clang C++20 Linux STL (ubuntu-22.04)	1m 16s
Syntax Check - Clang C++20 Linux STL Force C++03 (ubuntu-22.04)	1m 15s
	14m 10s

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