chore(deps): update dependency cosl to v1.3.1 (track/1)

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This PR contains the following updates:

Package	Change	Age	Confidence
cosl	==1.3.0 -> ==1.3.1

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• The Release Notes do not describe any breaking changes.

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Release Notes

canonical/cos-lib (cosl)

v1.3.1

Compare Source

What's Changed

• fix: Adds type_convert_stored to init by @​Gmerold in #​158

New Contributors

• @​Gmerold made their first contribution in #​158

Full Changelog: canonical/cos-lib@1.3.0...1.3.1

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Unused entries in .trivyignore

Image: ghcr.io/canonical/synapse:8dcf8b7592e44f598b200a71593e1ae9362dd9b2-_4.0_amd64

The following CVEs are in .trivyignore but not ignored by Trivy anymore:

• CVE-2025-47906