Mjcf : Fix parsing of armature parameters #75

Job	Run time
ubuntu-latest - Env all Release	39m 5s
ubuntu-latest - Env all Debug	39m 21s
ubuntu-latest - Env all-py39 Release	1m 51s
ubuntu-latest - Env all-py39 Debug	3m 42s
macos-latest - Env all Release	1m 56s
macos-latest - Env all Debug	3m 8s
macos-latest - Env all-py39 Release	26m 9s
macos-latest - Env all-py39 Debug	20m 46s
macos-13 - Env all Release	41m 56s
macos-13 - Env all Debug	7m 24s
macos-13 - Env all-py39 Release	3m 52s
macos-13 - Env all-py39 Debug	42m 3s
windows-latest - Env all Release	41m 35s
windows-latest - Env all-clang-cl Release	4m 23s
check-macos-linux-windows-pixi	4s
	4h 37m 15s

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