update oathkeeper to v0.40.7

[brahmlower]

Edit: Ignore this PR- I accidentally opened it to the upstream rather than our fork 😅

[CLAassistant]

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1 out of 2 committers have signed the CLA.

✅ brahmlower
❌ mmellison
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[brahmlower]

woah- I opened this to the wrong repo, sorry about that