fix(deps): bump dragonfly-core from 1.28.15 to 1.28.16

Bumps [dragonfly-core](https://github.com/ladybug-tools/dragonfly-core) from 1.28.15 to 1.28.16.
- [Release notes](https://github.com/ladybug-tools/dragonfly-core/releases)
- [Changelog](https://github.com/ladybug-tools/dragonfly-core/blob/master/.releaserc.json)
- [Commits](ladybug-tools/dragonfly-core@v1.28.15...v1.28.16)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements.txt

@@ -1,2 +1,2 @@
-dragonfly-core==1.28.15
+dragonfly-core==1.28.16
 uwg==5.8.3