add changelog entry

CHANGELOG.md

@@ -15,7 +15,7 @@
 
 - Updated bootnodes for Sepolia network.
 - Implemented [GetBlockAttestationV2](https://ethereum.github.io/beacon-APIs/?urls.primaryName=dev#/Beacon/getBlockAttestationsV2) (adding support for Electra attestations)
-
+- Implemented [GetAttestationsV2](https://ethereum.github.io/beacon-APIs/?urls.primaryName=dev#/Beacon/getPoolAttestationsV2) (adding support for Electra attestations)
 - Updated a number of parameters to reduce issues when using `p2p-subscribe-all-subnets-enabled`. If you have adjusted queue sizes manually when using all-subnets, please refer to details below. Manual settings will still override these defaults.
 - When `p2p-subscribe-all-subnets-enabled`, `p2p-peer-lower-bound` now defaults to 60 (previously 64), and `p2p-peer-upper-bound` now defaults to 80 (previously 100).
 - When `p2p-subscribe-all-subnets-enabled`,  (`Xnetwork-async-p2p-max-queue`, `Xnetwork-async-beaconchain-max-queue`, `Xp2p-batch-verify-signatures-queue-capacity`)  now default to 40_000 (previously 10_000)

data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/handlers/v1/beacon/GetAttestations.java

@@ -52,6 +52,7 @@ public GetAttestations(final NodeDataProvider nodeDataProvider, final Spec spec)
             .description(
                 "Retrieves attestations known by the node but not necessarily incorporated into any block.")
             .tags(TAG_BEACON)
+            .deprecated(true)
             .queryParam(SLOT_PARAMETER.withDescription(SLOT_QUERY_DESCRIPTION))
             .queryParam(COMMITTEE_INDEX_PARAMETER)
             .response(SC_OK, "Request successful", getResponseType(spec))