Mjcf : Fix parsing of armature parameters #67

Job	Run time
ubuntu-latest - Env all Release	26m 50s
ubuntu-latest - Env all Debug	26m 50s
ubuntu-latest - Env all-py39 Release	2m 31s
ubuntu-latest - Env all-py39 Debug	3m 43s
macos-latest - Env all Release	2m 13s
macos-latest - Env all Debug	2m 41s
macos-latest - Env all-py39 Release	21m 45s
macos-latest - Env all-py39 Debug	22m 27s
macos-13 - Env all Release	26m 55s
macos-13 - Env all Debug	4m 22s
macos-13 - Env all-py39 Release	5m 44s
macos-13 - Env all-py39 Debug	26m 54s
windows-latest - Env all Release	26m 42s
windows-latest - Env all-clang-cl Release	3m 52s
check-macos-linux-windows-pixi	3s
	3h 23m 32s

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