fix(rediscmd): include space in simple byte range (#3204)

[fumiyanokesinn]

Change isSimpleByte range from 0x21-0x7e to 0x20-0x7e to include space character.

Previously, queries like *=>[KNN 10 @v $v] were hex-encoded, making them unreadable in OpenTelemetry traces.

fixes #3204

Before extra/rediscmd/rediscmd_test.go

=== RUN   TestGinkgo
Running Suite: redisext - /Users/user/Workspace/go-redis/extra/rediscmd
=======================================================================
Random Seed: 1766668840

Will run 9 of 9 specs
••••
------------------------------
• [FAILED] [0.000 seconds]
AppendArg ... [It] 
/Users/user/Workspace/go-redis/extra/rediscmd/rediscmd_test.go:26

  [FAILED] Expected
      <string>: 666f6f20626172
  to equal
      <string>: foo bar
  In [It] at: /Users/user/Workspace/go-redis/extra/rediscmd/rediscmd_test.go:19 @ 12/25/25 22:20:40.917
------------------------------
••••

Summarizing 1 Failure:
  [FAIL] AppendArg ... [It] 
  /Users/user/Workspace/go-redis/extra/rediscmd/rediscmd_test.go:19

Ran 9 of 9 Specs in 0.001 seconds
FAIL! -- 8 Passed | 1 Failed | 0 Pending | 0 Skipped
--- FAIL: TestGinkgo (0.00s)
FAIL
FAIL    github.com/redis/go-redis/extra/rediscmd/v9     0.432s

After extra/rediscmd/rediscmd_test.go

=== RUN   TestGinkgo
Running Suite: redisext - /Users/user/Workspace/go-redis/extra/rediscmd
=======================================================================
Random Seed: 1766668833

Will run 9 of 9 specs
•••••••••

Ran 9 of 9 Specs in 0.001 seconds
SUCCESS! -- 9 Passed | 0 Failed | 0 Pending | 0 Skipped
--- PASS: TestGinkgo (0.00s)
PASS
ok      github.com/redis/go-redis/extra/rediscmd/v9     (cached)

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