IQSS#8295 add release notes per pdurbin

doc/release-notes/8295-support-postgresql-14.md

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+This release upgrades the bundled PostgreSQL JDBC driver to support major version 14.
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+Note that the newer PostgreSQL driver required a Flyway version bump, which entails positive and negative consequences:
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+- The newer version of Flyway supports PostgreSQL 14 and includes a number of security fixes.
+- As of version 8.0 the Flyway Community Edition dropped support for PostgreSQL 9.6 and older.
+
+Upgrade instructions may be found under “PostgreSQL Update” in the 5.10 release notes: https://github.com/IQSS/dataverse/releases/tag/v5.10