Update to EF tests v1.5.0-beta.1 (#6871)

No substantial changes in v1.5.0-beta.1, this PR just updates the tests.

The optimisation described in this PR is already implemented in our single-pass epoch processing:

- ethereum/consensus-specs#4081

testing/ef_tests/Makefile

@@ -1,4 +1,4 @@
-TESTS_TAG := v1.5.0-beta.0
+TESTS_TAG := v1.5.0-beta.1
 TESTS = general minimal mainnet
 TARBALLS = $(patsubst %,%-$(TESTS_TAG).tar.gz,$(TESTS))