CNV-91916:[CNV-4.20] Starlette: request.form() limits silently ignored for application/x-www-form-urlencoded enable DoS

[UdayYendva]

What this PR does / why we need it:

Since the project is using the starlette package as a transitive dependency(openshift-python-wrapper → fastmcp → mcp → starlette), it is affected byCVE-2026-54283 (GHSA-82w8-qh3p-5jfq). This vulnerability allows Denial of Service unbounded resource allocation in request.form() for URL-encoded requests (CVSS 7.5). This PR bumps starlette to >= 1.3.1 which
contains the fix.

Which issue(s) this PR fixes:

CVE-2026-54283 — starlette request.form() silently ignores configured limits (max_fields, max_part_size) for application/x-www-form-urlencoded requests, allowing field count and field size attacks.

Special notes for reviewer:

The dependency is transitive (4 levels deep) and only the lock file needs updating. No direct code changes are required. Practical risk is low since this is a test framework, but bumping resolves the vulnerability in dependency scanners.

jira-ticket:

https://redhat.atlassian.net/browse/CNV-91916

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[openshift-virtualization-qe-bot]

Clean rebase detected — no code changes compared to previous head (e5ecedb).

[openshift-virtualization-qe-bot-2]

Clean rebase detected — no code changes compared to previous head (2aab854).