Why was a Python requirement introduced in version 1.9.5?

[FSys77]

I was building my dockerized my FluentBit container since a couple of years now. No problems so was.

Base is a Ubuntu 20.04 LTS image (FROM ubuntu:focal).

The last working Fluent Bit version was 1.9.4 for me.

From version 1.9.5 onward it started complaining in the cmake phase:

/usr/bin/env: 'python3': No such file or directory
-- Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the system variable OPENSSL_ROOT_DIR (missing: OPENSSL_CRYPTO_LIBRARY OPENSSL_INCLUDE_DIR) 

Questions:
(1) Why is Python now required?
(2) What was changed regarding OpenSSL?

[patrick-stephens]

I think this is a duplicate of #6217 (comment) so let's try to keep in one place.