Bumped the Docker base image from python:3.14.5-slim to python:3.14.6-slim, picking up the upstream CPython fixes for CVE-2026-9669 (bz2 decompressor reuse out-of-bounds write), CVE-2026-7774 (tarfile data_filter path-traversal bypass), and CVE-2026-3276 (unicodedata.normalize CPU exhaustion). Also suppressed three base-image CVEs with no fix available in Debian trixie (graphite2 CVE-2026-50593, expat CVE-2026-50219, perl HTTP::Tiny CVE-2026-7010 — none reachable in this container) in .grype.yaml, and removed five suppressions for python CVEs that the 3.14.5/3.14.6 releases fixed.
