Add change note

Author: owen-mc

go/ql/src/change-notes/2025-10-21-go-weak-crypto-algorithm.md

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+category: newQuery
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+* Added a new query, `go/weak-crypto-algorithm`, to detect the use of a broken or weak cryptographic algorithm. A very simple version of this query was originally contributed as an [experimental query by @dilanbhalla](https://github.com/github/codeql-go/pull/284).
+* Added a new query, `go/weak-sensitive-data-hashing`, to detect the use of a broken or weak cryptographic hash algorithm on sensitive data.