changelogs/1.33.13: Add summary

Signed-off-by: Ryan Northey <[email protected]>

Author: phlax

changelogs/summary.md

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+* Security fixes:
+  - CVE-2025-64527: Envoy crashes when JWT authentication is configured with the remote JWKS fetching
+  - CVE-2025-66220: TLS certificate matcher for `match_typed_subject_alt_names` may incorrectly treat certificates containing an embedded null byte
+  - CVE-2025-64763: Potential request smuggling from early data after the CONNECT upgrade