docs: link SDM release guide to the internal base image runbook

[devin-ai-integration]

Summary

Requested by AJ Steers (@aaronsteers) as a back-link to the new internal runbook.

docs/RELEASES.md explains how CDK and SDM releases work, but nothing in this repo mentions the base image that SDM is built on: the python-connector-base pin in the root Dockerfile is bumped by hand, and merging that bump publishes nothing — the new SDM image only ships with the next CDK release. This adds a paragraph under the title stating that and linking the internal runbook that documents the whole lifecycle:

https://internal.airbyte.ai/docs/internal-docs/teams/apis/data-replication/runbooks/connector-base-images

The link is Airbyte-employee-only, and 404s until the runbook lands (https://github.com/airbytehq/internal.airbyte.ai/pull/426).

Link to Devin session: https://app.devin.ai/sessions/19639cc07c8d4b32bcf6442d50243a07
Open in Devin Desktop: https://app.devin.ai/desktop/session/19639cc07c8d4b32bcf6442d50243a07?variant=devin

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Pull request overview

Adds context to the release management guide to clarify how the SDM image relates to the python-connector-base pin and where to find the internal lifecycle/runbook documentation.

Changes:

• Documents that bumping the python-connector-base pin in the root Dockerfile does not itself publish a new SDM image.
• Adds an internal (employee-only) runbook link for the connector base image lifecycle.

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[github-actions]

PyTest Results (Fast)

4 363 tests  ±0   4 351 ✅ ±0   8m 22s ⏱️ - 1m 12s
    1 suites ±0      12 💤 ±0 
    1 files   ±0       0 ❌ ±0 

Results for commit a004f59. ± Comparison against base commit 7c96f9d.