cmd/devp2p, eth: drop eth/66 (#28239)

* cmd/devp2p, eth: drop eth/66

* eth/protocols/eth: yes sir, linter

eth/fetcher/block_fetcher.go

@@ -483,7 +483,7 @@ func (f *BlockFetcher) loop() {
 							select {
 							case res := <-resCh:
 								res.Done <- nil
-								f.FilterHeaders(peer, *res.Res.(*eth.BlockHeadersPacket), time.Now().Add(res.Time))
+								f.FilterHeaders(peer, *res.Res.(*eth.BlockHeadersRequest), time.Now().Add(res.Time))
 
 							case <-timeout.C:
 								// The peer didn't respond in time. The request
@@ -541,7 +541,7 @@ func (f *BlockFetcher) loop() {
 					case res := <-resCh:
 						res.Done <- nil
 						// Ignoring withdrawals here, since the block fetcher is not used post-merge.
-						txs, uncles, _ := res.Res.(*eth.BlockBodiesPacket).Unpack()
+						txs, uncles, _ := res.Res.(*eth.BlockBodiesResponse).Unpack()
 						f.FilterBodies(peer, txs, uncles, time.Now())
 
 					case <-timeout.C:

eth/fetcher/block_fetcher_test.go

@@ -213,7 +213,7 @@ func (f *fetcherTester) makeHeaderFetcher(peer string, blocks map[common.Hash]*t
 		}
 		res := &eth.Response{
 			Req:  req,
-			Res:  (*eth.BlockHeadersPacket)(&headers),
+			Res:  (*eth.BlockHeadersRequest)(&headers),
 			Time: drift,
 			Done: make(chan error, 1), // Ignore the returned status
 		}
@@ -255,7 +255,7 @@ func (f *fetcherTester) makeBodyFetcher(peer string, blocks map[common.Hash]*typ
 		}
 		res := &eth.Response{
 			Req:  req,
-			Res:  (*eth.BlockBodiesPacket)(&bodies),
+			Res:  (*eth.BlockBodiesResponse)(&bodies),
 			Time: drift,
 			Done: make(chan error, 1), // Ignore the returned status
 		}