fix(deps): bump python-multipart, cryptography, pyjwt (HIGH security alerts)

[olaservo]

Motivation and Context

A fresh batch of Dependabot alerts was disclosed on 2026-06-15/16 — after #4376 merged — affecting three transitive Python dependencies pinned across the fetch, git, and time server lockfiles. This bumps each past its fix floor:

Package	Before	After	Notable advisory
python-multipart	0.0.27	0.0.32	CVE-2026-53539 (HIGH, quadratic-time querystring DoS) + CVE-2026-53537/53538/53540 (param smuggling / unbounded buffering)
cryptography	48.0.0	49.0.0	GHSA-537c-gmf6-5ccf (HIGH, vulnerable OpenSSL statically linked in wheels < 48.0.1)
pyjwt	2.12.1	2.13.0	HIGH + medium JWT advisories

All three are transitive deps — lockfiles only, no pyproject.toml changes. The diff is scoped to exactly these 9 version bumps (3 packages × 3 servers) with no other resolution churn.

How Has This Been Tested?

• uv lock --upgrade-package for each of the three packages in src/fetch, src/git, src/time; confirmed each lockfile lands on python-multipart ≥0.0.31, cryptography ≥48.0.1, pyjwt ≥2.13.0.
• Ran the git server test suite against both the new and base lockfiles: identical results (43 passed; the 37 errors are pre-existing Windows tempdir handle-leaks in fixtures, independent of the dependency versions). No regressions introduced by the bump.

Breaking Changes

None. Transitive runtime deps only.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist

• My code follows the repository's style guidelines
• I have read the MCP Protocol Documentation
• My changes generate no new warnings
• I have tested my changes against the affected servers

Additional context

Not covered here: the 4 medium mcp-server-git self-advisories (#134–137), which concern the git server's own published package version and are a separate change.

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