Prepare for release 0.4

Signed-off-by: Sahas Subramanian <sahas.subramanian@proton.me>

Author: shsms

RELEASE_NOTES.md

@@ -2,8 +2,6 @@
 
 ## Upgrading
 
-- This release updates the `frequenz-microgrid-component-graph` rust crate version to 0.4.
-
 - This release updates the `frequenz-microgrid-component-graph` rust crate version to 0.5.  `ComponentGraphConfig` is restructured to match: the six per-category `prefer_X_in_Y_formula` flags are replaced by a global `prefer_meters_in_component_formulas` plus per-formula overrides via the new `FormulaOverrides` class.  Also exposes the new `steam_boiler_formula` method, and renames `battery_coalesce_formula` / `pv_coalesce_formula` to `battery_ac_coalesce_formula` / `pv_ac_coalesce_formula`.
 
 - `ComponentGraphConfig.__init__` is now declared as keyword-only in the type stubs (the runtime was already keyword-only, so positional calls were already failing at runtime).