Update dependency kubernetes/kubernetes to v1.19.15

This MR contains the following updates:

Package	Type	Update	Change
kubernetes/kubernetes	ironbank-github	patch	v1.19.14 -> v1.19.15
kubernetes/kubernetes		patch	v1.19.14 -> v1.19.15

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Release Notes

kubernetes/kubernetes

v1.19.15

Compare Source

See kubernetes-announce@. Additional binary downloads are linked in the CHANGELOG.

See the CHANGELOG for more details.

Release Assets

Kubernetes Source Code: kubernetes.tar.gz
SHA256	f3134e2babbcdb7a9c00643c29a50ad03f010770edcabe9c068909da2ab57547
SHA512	9e680720e88a804e970bd298c928396f5f5083f4d4bf3c3f2dec296b63600508de9cbc353f1e273ea3cc939777a5caebed209c40c1b01b72ca07b5ad27fb2d03

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