Pin `libxml2` version to 2.13.7 #1314

Job	Run time
Build conda env file	1m 30s
Build conda env file	1m 30s
Run tests with oneMKL develop branch (3.12, ubuntu-22.04)	24m 59s
Run tests with oneMKL develop branch (3.12, ubuntu-22.04)	32m 45s
Run tests with oneMKL tag (3.12, ubuntu-22.04)	24m 29s
Run tests with oneMKL tag (3.12, ubuntu-22.04)	24m 29s
	1h 49m 42s

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