Remove support for 3.6

[ocelotl]

Python 3.6 has reached end of life. Remove support for 3.6.

[ocelotl]

It has been decided in the SIG that support for versions will be removed 6 months after their end of life.

[aabmass]

@overmeulen do you mind sharing what you said in the SIG here?

[overmeulen]

Sure. Our current goal is to provide monitoring capabilities to our clients for our solution.
For that we heavily rely on the opentelemetry Python metrics SDK.
Today the requirement we give our clients is to use RHEL8 , which is still in full support phase until 2024.
The problem is that the default Python version in RHEL8 is Python 3.6.8.
We definitely need to bump our version of Python but this will have a huge impact for us and will require some time.
That's why it would be nice if you could extend the support of Python 3.6.
Ideally we would need a stable release of the metrics SDK supporting Python 3.6 and then a few months of support just to make sure we can still upgrade if a bug is found.

[ocelotl]

As discussed in the SIG, I am ok with keeping support for 3.6 until we have a stable metrics release.

@lzchen @srikanthccv WDYT?

[lzchen]

I am okay with this as well.

[srikanthccv]

+1.