fix(deps): update dependency @hello.nrfcloud.com/proto to v15.3.43 (#414)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -57,7 +57,7 @@
     "yaml": "2.7.0"
   },
   "dependencies": {
-    "@hello.nrfcloud.com/proto": "15.3.42",
+    "@hello.nrfcloud.com/proto": "15.3.43",
     "@hello.nrfcloud.com/proto-map": "16.1.38",
     "@sinclair/typebox": "0.34.21",
     "e118-iin-list": "4.3.1",