Release v4.3-beta1 (#19172)

* Draft changelog for v4.3 release

* Add release notes summary & nav link

* Docs cleanup

* Update Python dependencies

* Update static assets

* Revert errant change to schema

* Fix minimum PostgreSQL version

* Misc cleanup

* Correct issue numbers in change log

netbox/project-static/package.json

@@ -23,14 +23,14 @@
   },
   "dependencies": {
     "@mdi/font": "7.4.47",
-    "@tabler/core": "1.0.0",
-    "bootstrap": "5.3.3",
+    "@tabler/core": "1.1.1",
+    "bootstrap": "5.3.5",
     "clipboard": "2.0.11",
     "flatpickr": "4.6.13",
-    "gridstack": "11.5.0",
+    "gridstack": "12.0.0",
     "htmx.org": "2.0.4",
     "query-string": "9.1.1",
-    "sass": "1.86.0",
+    "sass": "1.86.3",
     "tom-select": "2.4.3",
     "typeface-inter": "3.18.1",
     "typeface-roboto-mono": "1.1.13"