Mjcf : Fix parsing of armature parameters #77

Job	Run time
ubuntu-latest - Env all Release	41m 23s
ubuntu-latest - Env all Debug	40m 53s
ubuntu-latest - Env all-py39 Release	2m 6s
ubuntu-latest - Env all-py39 Debug	3m 44s
macos-latest - Env all Release	4m 5s
macos-latest - Env all Debug	4m 15s
macos-latest - Env all-py39 Release	24m 7s
macos-latest - Env all-py39 Debug	32m 50s
macos-13 - Env all Release	51m 39s
macos-13 - Env all Debug	7m 46s
macos-13 - Env all-py39 Release	2m 40s
macos-13 - Env all-py39 Debug	51m 38s
windows-latest - Env all Release	1h 10m 24s
windows-latest - Env all-clang-cl Release	4m 26s
check-macos-linux-windows-pixi	4s
	5h 42m 0s

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