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What type of PR is this?
Bug Fix
What does this PR do? Why is it needed?
Nethermind in their v1.16.x version introduced stricter limiting of json-rpc requests and this led to issues with prysm as detailed here: NethermindEth/nethermind#5208
Upon further investigation it was revealed that nethermind had the same header request limit as prysm and despite that, the above error was still being encountered. After some debugging, it was determined that prysm had an off-by-1 in the batch header requesting logic. This PR corrects that bug.
Which issues(s) does this PR fix?
N.A
Other notes for review