[SECURITY] Remove OTLP HTTP support for TLS 1.0 and TLS 1.1, require TLS 1.2

[marcalff]

Fixes #2721

Changes

Please provide a brief description of the changes here.

• Remove support for min/max TLS 1.0 in the OTLP HTTP exporter
• Remove support for min/max TLS 1.1 in the OTLP HTTP exporter
• Require TLS 1.2 or better by default
• This complies with https://www.ietf.org/rfc/rfc8996.html

For significant contributions please make sure you have completed the following items:

• [X] CHANGELOG.md updated for non-trivial changes
• [ ] Unit tests have been added
• [ ] Changes in public API reviewed