Cluster determine slot command name need upper

[yangbodong22011]

The judgment of the name is all uppercase, for example:
https://github.com/redis/redis-py/blob/master/redis/cluster.py#L970

if command in ("EVAL", "EVALSHA"): 

Repro code

#!/usr/bin/env python #-*- coding: utf-8 -*- from redis.cluster import RedisCluster host = '127.0.0.1' port = 30001 user = 'default' pwd = "" rc = RedisCluster(host=host, port=port, username=user, password=pwd) print(rc.execute_command('EVAL', 'return', '0', 'hello')) 

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.05% 🎉

Comparison is base (19b55c6) 91.29% compared to head (4bd4324) 91.34%.
Report is 14 commits behind head on master.

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Additional details and impacted files

@@ Coverage Diff @@ ## master #2919 +/- ## ========================================== + Coverage 91.29% 91.34% +0.05%  ========================================== Files 126 126 Lines 32391 32335 -56 ========================================== - Hits 29570 29538 -32  + Misses 2821 2797 -24 

Files Changed	Coverage Δ
redis/asyncio/cluster.py	91.66% <100.00%> (ø)
redis/cluster.py	92.81% <100.00%> (ø)

... and 19 files with indirect coverage changes

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