Bump pannellum from 2.4.1 to 2.5.6

Bumps [pannellum](https://github.com/mpetroff/pannellum) from 2.4.1 to 2.5.6.
- [Release notes](https://github.com/mpetroff/pannellum/releases)
- [Changelog](https://github.com/mpetroff/pannellum/blob/master/changelog.md)
- [Commits](https://github.com/mpetroff/pannellum/compare/2.4.1...2.5.6)

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

package.json

@@ -59,7 +59,7 @@
     "martinez-polygon-clipping": "0.6.2",
     "node-diff3": "1.0.0",
     "osm-auth": "1.0.2",
-    "pannellum": "2.4.1",
+    "pannellum": "2.5.6",
     "rbush": "3.0.1",
     "string.fromcodepoint": "0.2.1",
     "which-polygon": "2.2.0"