fix(deps): update dependency protobuf to v7

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
protobuf	==6.33.6 → ==7.34.1

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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: uv.lock

Command failed: uv lock --upgrade-package protobuf --upgrade-package protobuf
Using CPython 3.14.5 interpreter at: /opt/containerbase/tools/python/3.14.5/bin/python3
  × No solution found when resolving dependencies:
  ╰─▶ Because grpcio-tools==1.80.0 depends on protobuf>=6.31.1,<7.0.0 and
      your project depends on grpcio-tools==1.80.0, we can conclude that your
      project depends on protobuf>=6.31.1,<7.0.0.
      And because your project depends on protobuf==7.34.1, we can conclude
      that your project's requirements are unsatisfiable.

[hanstrompert]

Protobuf v7 Compatibility Analysis

Blocker: grpcio-tools

The latest grpcio-tools (1.80.0) pins protobuf<7.0.0. This PR cannot be merged until a new grpcio-tools release drops that upper bound.

Python breaking changes in protobuf v7 (repo v34.0)

• FieldDescriptor.label removed — use is_repeated() / is_required() instead
• UseDeprecatedLegacyJsonFieldConflicts() removed
• float_format / double_format removed from text_format
• float_precision removed from json_format
• Assigning bool to int/enum fields now raises an error
• Non-datetime → Timestamp and non-timedelta → Duration conversions now raise TypeError instead of AttributeError

SuPA code impact: none

Checked the codebase — none of the removed/changed APIs are used. The FromDatetime() / ToDatetime() calls all pass proper datetime objects. Once grpcio-tools supports protobuf v7, this upgrade should require no code changes.