Update to consensus-spec-tests v1.1.3 (#2722)

## Issue Addressed

NA

## Proposed Changes

Updates to `testing/ef_tests` to use https://github.com/ethereum/consensus-spec-tests/releases/tag/v1.1.3.

Also updates `initialize_beacon_state_from_eth1` to set the `state.fork.previous_version` to the Altair fork version when starting a new Altair chain from genesis. This will not have an effect on mainnet or any long-lived testnets. This was introduced in https://github.com/ethereum/consensus-specs/releases/tag/v1.1.1.

## Additional Info

NA

testing/ef_tests/Makefile

@@ -1,4 +1,4 @@
-TESTS_TAG := v1.1.0-beta.4
+TESTS_TAG := v1.1.3
 TESTS = general minimal mainnet
 TARBALLS = $(patsubst %,%-$(TESTS_TAG).tar.gz,$(TESTS))
 

testing/ef_tests/check_all_files_accessed.py

@@ -43,6 +43,9 @@ excluded_paths = [
     "tests/minimal/phase0/fork_choice",
     "tests/mainnet/altair/fork_choice",
     "tests/minimal/altair/fork_choice",
+    # Merkle-proof tests for light clients
+    "tests/mainnet/altair/merkle/single_proof/pyspec_tests/",
+    "tests/minimal/altair/merkle/single_proof/pyspec_tests/"
 ]
 
 def normalize_path(path):