build(deps): bump sortablejs from 1.15.2 to 1.15.6

Bumps [sortablejs](https://github.com/SortableJS/Sortable) from 1.15.2 to 1.15.6.
- [Release notes](https://github.com/SortableJS/Sortable/releases)
- [Commits](https://github.com/SortableJS/Sortable/compare/1.15.2...1.15.6)

---
updated-dependencies:
- dependency-name: sortablejs
  dependency-version: 1.15.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

package-lock.json

@@ -70,7 +70,7 @@
 				"prosemirror-view": "^1.34.3",
 				"pyodide": "^0.27.3",
 				"socket.io-client": "^4.2.0",
-				"sortablejs": "^1.15.2",
+				"sortablejs": "^1.15.6",
 				"svelte-sonner": "^0.3.19",
 				"tippy.js": "^6.3.7",
 				"turndown": "^7.2.0",
@@ -11138,9 +11138,10 @@
 			}
 		},
 		"node_modules/sortablejs": {
-			"version": "1.15.2",
-			"resolved": "https://registry.npmjs.org/sortablejs/-/sortablejs-1.15.2.tgz",
-			"integrity": "sha512-FJF5jgdfvoKn1MAKSdGs33bIqLi3LmsgVTliuX6iITj834F+JRQZN90Z93yql8h0K2t0RwDPBmxwlbZfDcxNZA=="
+			"version": "1.15.6",
+			"resolved": "https://registry.npmjs.org/sortablejs/-/sortablejs-1.15.6.tgz",
+			"integrity": "sha512-aNfiuwMEpfBM/CN6LY0ibyhxPfPbyFeBTYJKCvzkJ2GkUpazIt3H+QIPAMHwqQ7tMKaHz1Qj+rJJCqljnf4p3A==",
+			"license": "MIT"
 		},
 		"node_modules/source-map-js": {
 			"version": "1.2.1",

package.json

@@ -114,7 +114,7 @@
 		"prosemirror-view": "^1.34.3",
 		"pyodide": "^0.27.3",
 		"socket.io-client": "^4.2.0",
-		"sortablejs": "^1.15.2",
+		"sortablejs": "^1.15.6",
 		"svelte-sonner": "^0.3.19",
 		"tippy.js": "^6.3.7",
 		"turndown": "^7.2.0",