Potential fix for code scanning alert no. 14: Module is imported with 'import' and 'import from'

[zliang-akamai]

Potential fix for https://github.com/linode/py-metadata/security/code-scanning/14

To fix the problem, avoid importing logging both with import logging and from logging import Logger. Since the code already uses logging.getLogger, we should keep import logging and remove the from logging import Logger import. Then, fully-qualify the Logger annotation where it is used.

Concretely:

• In linode_metadata/watcher.py, delete the line from logging import Logger.
• Change the type annotation _logger: Logger in BaseMetadataWatcher to _logger: logging.Logger, which uses the already-imported logging module.
• No other code changes are required; runtime behavior remains the same, as this only affects imports and annotations.

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[lgarber-akamai]

LGTM!