[opentelemetry-php-contrib] opentelemetry-auto-doctrine should support php 8.0 and 8.1

[4o3F]

Is your feature request related to a problem?
Current open-telemetry/opentelemetry-auto-doctrine is designed based on the PDO instrument, while PDO need PHP8.2 and up, Doctrine with custom driver can work since PHP8.0, so the requirement should be dropped to support more versions.

Describe the solution you'd like
DominicDetta has confirmed in his PR comment that PHP 8.0 can work, so we should change the version requirement back.

[brettmc]

That's true, it should work with 8.1 since it's not an extension. Our support policy dropped 8.0 support when official support ended.
Since I have a PR open against doctrine already, I added 8.1 support in open-telemetry/opentelemetry-php-contrib@7c3a020

[brettmc]

Fixed by open-telemetry/opentelemetry-php-contrib#374