chore: Update changelog for dfx 0.24.3 release (#3986)

CHANGELOG.md

@@ -2,19 +2,12 @@
 
 # UNRELEASED
 
+# 0.24.3
+
 ### feat: Bitcoin support in PocketIC
 
 `dfx start --pocketic` is now compatible with `--bitcoin-node` and `--enable-bitcoin`.
 
-### feat: all commands will use the DFX_NETWORK from the environment
-
-If `DFX_NETWORK` is set in the environment, all commands will use that network by default.
-The `--network` parameter will take precedence if provided.
-
-### fix: dfx generate now honors the --network parameter
-This fixes an issue where `dfx deploy --playground` would fail if the project
-had not been previously built for the local network.
-
 ### feat: facade pull ICP, ckBTC, ckETH ledger canisters
 
 The ledger canisters can be pulled even though they are not really "pullable".