docs(changelog): update release notes for version 2.2.9

ChangeLog

@@ -1,3 +1,44 @@
+Version 2.2.9 (May 26, 2025)
+----------------------------
+
+* refactor(googlereader): remove redundant log message
+* refactor(googlereader): move constants to separate files
+* fix(webauthn): correct argument in debug log
+* fix(sanitizer): MathML tags are not fully supported by `golang.org/x/net/html`
+* fix(migrations): prevent failure at version 45 with long entry URLs
+* fix(locale): localize Git commit label in about page
+* fix(googlereader): return a 400 instead of 500 for invalid edit requests
+* fix(googlereader): handle various item ID formats
+* fix(googlereader): avoid panic for inexisting feed or category
+* fix(googlereader): `/items/contents` should accept short form item IDs
+* feat(webauthn): prefer creation of a client-side discoverable credential
+* feat(urlcleaner): remove the `ref` parameter from url
+* feat(settings): replace `div.panel` with paragraph tags for OAuth2 links
+* feat(settings): add validation for entry order and categories sorting order
+* feat(settings): add option to always open articles externally
+* feat(server): add liveness and readiness probes
+* feat(sanitizer): add MathML tags to the sanitizer
+* feat(sanitized): allow Spotify iframes
+* feat(rssbridge): support authentication token for RSS-Bridge
+* feat(response): change error response content type to plain text and escape HTML
+* feat(reader): populate feed description automatically
+* feat(locale): update Russian translation
+* feat(locale): update Polish translation
+* feat(locale): update French translation
+* feat(googlereader): avoid SQL query to fetch username in streamItemContentsHandler
+* feat(googlereader): add `mark-all-as-read` endpoint
+* feat(api): add new endpoints to manage API keys
+* ci: remove deprecated `reviewers` field from `dependantbot.yml`
+* chore(gitignore): ignore miniflux binary in root directory
+* build(deps): bump `golangci/golangci-lint-action` from `7` to `8`
+* build(deps): bump `golang.org/x/oauth2` from `0.29.0` to `0.30.0`
+* build(deps): bump `golang.org/x/net` from `0.39.0` to `0.40.0`
+* build(deps): bump `golang.org/x/image` from `0.26.0` to `0.27.0`
+* build(deps): bump `golang.org/x/crypto` from `0.37.0` to `0.38.0`
+* build(deps): bump `github.com/tdewolff/minify/v2` from `2.23.3` to `2.23.8`
+* build(deps): bump `github.com/tdewolff/minify/v2` from `2.23.1` to `2.23.3`
+* build(deps): bump `github.com/go-webauthn/webauthn` from `0.12.3` to `0.13.0`
+
 Version 2.2.8 (April 22, 2025)
 ------------------------------