Bump FGA model version to 10.2.0

Adding executive_director relation requires a minor bump.
10.1.0 was taken by the LFXV2-1431 audit fix (PR #127).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Issue: LFXV2-1556
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

Author: bramwelt

charts/lfx-platform/templates/openfga/model.yaml

@@ -24,7 +24,7 @@ spec:
 */}}
     - version:
         major: 10
-        minor: 1
+        minor: 2
         patch: 0
       authorizationModel: |
         model