Update python Docker tag to v3.14

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
python	stage	minor	3.11-slim → 3.14-slim

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[robcoward]

Build failed when building confluent-kafka package on Python 3.14:

Error from build log:

fatal error: librdkafka/rdkafka.h: No such file or directory

This appears to be a compatibility issue between:

• Python 3.14 (very new, released recently)
• confluent-kafka 2.13.0 package which requires librdkafka C library headers

Recommendation: Close this PR for now. Python 3.14 support may require:

1. Waiting for confluent-kafka to release a version compatible with Python 3.14
2. Updating the Dockerfile to install additional system dependencies for Python 3.14
3. Or staying on Python 3.11 until the ecosystem catches up

This is not a critical update and Python 3.11 is well-supported.

[robcoward]

Closing as Python 3.14 is too new and has compatibility issues with confluent-kafka. Will revisit when the ecosystem has better Python 3.14 support.

[renovate]

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