update gas snapshot

Author: anna-carroll

.gas-snapshot

@@ -1,7 +1,6 @@
-HelpersTest:test_signature() (gas: 6587)
-ZenithTest:test_badSequence() (gas: 77167)
-ZenithTest:test_badSignature() (gas: 66732)
-ZenithTest:test_blockExpired() (gas: 55352)
-ZenithTest:test_notSequencer() (gas: 58463)
-ZenithTest:test_onePerBlock() (gas: 123114)
-ZenithTest:test_submitBlock() (gas: 90231)
+ZenithTest:test_badSequence() (gas: 77339)
+ZenithTest:test_badSignature() (gas: 66856)
+ZenithTest:test_blockExpired() (gas: 55471)
+ZenithTest:test_notSequencer() (gas: 58576)
+ZenithTest:test_onePerBlock() (gas: 123118)
+ZenithTest:test_submitBlock() (gas: 90078)