Changed API method for eth-beacon

[karen-stepanyan]

DF-19699

Updated eth-beacon balance transport to use POST method instead of GET when querying balances of addresses.

Note for reviewer No functional tests were performed due to lack of ETH_CONSENSUS_RPC_URL (beacon node)

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 9c2cd730484854197868e3f65def75f4f5363c7f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@chainlink/eth-beacon-adapter	Major
@chainlink/proof-of-reserves-adapter	Patch
@chainlink/renvm-address-set-adapter	Patch

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[mmcallister-cll]

OK to merge this despite EA framework check failure -- new EA framework version just went in (should be addressed in a PR that updates all ea-framework versions)