fix(deps): update dependency tensorflow to >=2.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
tensorflow	>=2.20.0 → >=2.21.0

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
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The artifact failure details are included below:

File name: MAGE/uv.lock

Command failed: uv lock --upgrade-package tensorflow
Using CPython 3.14.4 interpreter at: /opt/containerbase/tools/python/3.14.4/bin/python3
  × No solution found when resolving dependencies for split (markers:
  │ sys_platform == 'darwin'):
  ╰─▶ Because tensorflow{sys_platform == 'darwin'}==2.21.0 has no
      wheels with a matching Python version tag (e.g., `cp314`) and only
      tensorflow{sys_platform == 'darwin'}<=2.21.0 is available, we can
      conclude that tensorflow{sys_platform == 'darwin'}>=2.21.0 cannot be
      used.
      And because mage depends on tensorflow{sys_platform == 'darwin'}>=2.21.0
      and your workspace requires mage, we can conclude that your workspace's
      requirements are unsatisfiable.

      hint: The resolution failed for an environment that is not the current
      one, consider limiting the environments with `tool.uv.environments`.

      hint: Wheels are available for `tensorflow` (v2.21.0) with the following
      Python ABI tags: `cp310`, `cp311`, `cp312`, `cp313`

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

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