Werk #10131: Bumped shipped Python version from 3.8.6 to 3.8.7

Component	Other components
Title	Bumped shipped Python version from 3.8.6 to 3.8.7
Date	Feb 3, 2021
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0b6 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Python 3.8.7 contains quite a few bug fixes, see https://docs.python.org/release/3.8.7/whatsnew/changelog.html.

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