[MNT] remove redundant soft dependency checks

[SebastianSchmidl]

Reference Issues/PRs

none, but inspired by this PR comment

What does this implement/fix? Explain your changes.

• removes redundant calls to _check_soft_dependencies in estimators (this is already done by the __init__-function of the base classes
• adds the correct version bound for pyod in PyODAdapter since a new version with the pyod.__version__-attribute was published

Does your contribution introduce a new dependency? If yes, which one?

no

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[MatthewMiddlehurst]

Have of question on pyod but LGTM if you want to keep it as is.

[TonyBagnall]

lgtm