chore(release): bump version to 6.2.9 (#479)

Ships #477 (ISSUE-161: Dr.Egeria entry points resolve the Egeria user
at run time with one precedence chain, via resolve_egeria_credentials)
and #478 (Dr.Egeria Postgres Server/Database Element commands take
secrets-store attributes; Database User Id / Database Password removed).

Signed-off-by: Dan Wolfson <dan.wolfson@pdr-associates.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Author: dwolfson

pyproject.toml

@@ -3,7 +3,7 @@
 
 [project]
 name = "pyegeria"
-version = "6.2.8"
+version = "6.2.9"
 license = 'Apache-2.0'
 license-files = ["LICENSE"]
 authors = [{name = "Dan Wolfson", email = "dan.wolfson@pdr-associates.com"},]