chore: prepare release (#3123)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

.changeset/big-dingos-live.md

@@ -1,5 +1,16 @@
 # @patternfly/pfe-core
 
+## 6.0.0
+### Major Changes
+
+- bd4397a: **`CascadeController`** and **`@cascades`** decorator are removed. Use [`@lit/context`](https://lit.dev/docs/data/context/) instead for sharing data between parent and child elements.
+  **`SlotController.anonymous`** is removed. Use `SlotController.default` instead.
+
+### Patch Changes
+
+- 6d1520a: `FloatingDOMController`: support usage within iframes
+- 3a64fd3: `InternalsController`: allows accessibility auditing tools to access element internals.
+
 ## 5.0.8
 ### Patch Changes
 

.changeset/remove-bundled-entrypoint.md

@@ -1,6 +1,6 @@
 {
   "name": "@patternfly/pfe-core",
-  "version": "5.0.8",
+  "version": "6.0.0",
   "license": "MIT",
   "description": "PatternFly Elements Core Library",
   "customElements": "custom-elements.json",