Bump external/magic_enum from `126539e` to `a72a053` #1949

Job	Run time
clang-tidy	44s
cmake-lint	27s
Codacy Security Scan	5m 12s
code-ql (cpp, gcc-14)	2m 8s
cppcheck	1m 5s
DevSkim	33s
include-what-you-use	34s
msvc-code-analysis (RelWithDebInfo)	4m 42s
ShellCheck	12s
	15m 37s

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