chore: Remove deprecated db.redis op (#19932)

Author: alexander-alderman-webb

develop-docs/sdk/telemetry/traces/span-operations.mdx

@@ -162,7 +162,6 @@ Databased related spans are expected to follow OpenTelemetry's [Database](https:
 |          | db.query             |                            |
 |          | db.sql.query         |                            |
 |          | db.sql.prisma        |                            |
-|          | db.redis             |                            |
 |          | db.sql.active_record |                            |
 |          | db.sql.execute       |                            |
 |          | db.sql.transaction   |                            |