Bump StackExchange.Redis from 2.5.61 to 2.6.86 in /tests/unittests

[dependabot]

Bumps StackExchange.Redis from 2.5.61 to 2.6.86.

Changelog

Sourced from StackExchange.Redis's changelog.

2.6.86

• Fix #1520 & #1660: When MOVED is encountered from a cluster, a reconfigure will happen proactively to react to cluster changes ASAP (#2286 by NickCraver)
• Fix #2249: Properly handle a fail state (new ClusterNode.IsFail property) for CLUSTER NODES and expose fail? as a property (IsPossiblyFail) as well (#2288 by NickCraver)
• Adds: IConnectionMultiplexer.ServerMaintenanceEvent (was on ConnectionMultiplexer but not the interface) (#2306 by NickCraver)
• Adds: To timeout messages, additional debug information: Sync-Ops (synchronous operations), Async-Ops (asynchronous operations), and Server-Connected-Seconds (how long the connection in question has been connected, or "n/a") (#2300 by NickCraver)

2.6.80

• Adds: last-in and cur-in (bytes) to timeout exceptions to help identify timeouts that were just-behind another large payload off the wire (#2276 by NickCraver)
• Adds: general-purpose tunnel support, with HTTP proxy "connect" support included (#2274 by mgravell)
• Removes: Package dependency (System.Diagnostics.PerformanceCounter) (#2285 by NickCraver)

2.6.70

• Fix: MOVED with NoRedirect (and other non-reachable errors) should respect the IncludeDetailInExceptions setting (#2267 by mgravell)
• Fix #2251 & #2265: Cluster endpoint connections weren't proactively connecting subscriptions in all cases and taking the full connection timeout to complete as a result (#2268 by iteplov)

2.6.66

• Fix #2182: Be more flexible in which commands are "primary only" in order to support users with replicas that are explicitly configured to allow writes (#2183 by slorello89)
• Adds: IConnectionMultiplexer now implements IAsyncDisposable (#2161 by kimsey0)
• Adds: IConnectionMultiplexer.GetServers() to get all IServer instances for a multiplexer (#2203 by NickCraver)
• Fix #2016: Align server selection with supported commands (e.g. with writable servers) to reduce Command cannot be issued to a replica errors (#2191 by slorello89)
• Performance: Optimization around timeout processing to reduce lock contention in the case of many items that haven't yet timed out during a heartbeat (#2217 by NickCraver)
• Fix #2223: Resolve sync-context issues (missing ConfigureAwait(false)) (#2229 by mgravell)
• Fix #1968: Improved handling of EVAL scripts during server restarts and failovers, detecting and re-sending the script for a retry when needed (#2170 by martintmk)
• Adds: ConfigurationOptions.SslClientAuthenticationOptions (netcoreapp3.1/net5.0+ only) to give more control over SSL/TLS authentication (#2224 by NickCraver)
• Fix #2240: Improve support for DNS-based IPv6 endpoints (#2241 by NickCraver)
• Adds: ConfigurationOptions.HeartbeatInterval (Advanced Setting - see docs) To allow more finite control of the client heartbeat, which encompases how often command timeouts are actually evaluated - still defaults to 1,000 ms (#2243 by NickCraver)
• Fix #1879: Improve exception message when the wrong password is used (#2246 by NickCraver)
• Fix #2233: Repeated connection to Sentinel servers using the same ConfigurationOptions would fail (#2242 by NickCraver)

2.6.48

• URGENT Fix: #2167, #2176: fix error in batch/transaction handling that can result in out-of-order instructions (#2177 by MarcGravell)
• Fix: #2164: fix LuaScript.Prepare for scripts that don't have parameters (#2166 by MarcGravell)

2.6.45

• Adds: Nullable reference type annotations (#2041 by NickCraver)
  • Adds annotations themselves for nullability to everything in the library
  • Fixes a few internal edge cases that will now throw proper errors (rather than a downstream null reference)
  • Fixes inconsistencies with null vs. empty array returns (preferring an not-null empty array in those edge cases)
  • Note: does not increment a major version (as these are warnings to consumers), because: they're warnings (errors are opt-in), removing obsolete types with a 3.0 rev would be binary breaking (this isn't), and reving to 3.0 would cause binding redirect pain for consumers. Bumping from 2.5 to 2.6 only for this change.
• Adds: Support for COPY with .KeyCopy()/.KeyCopyAsync() (#2064 by Avital-Fine)

... (truncated)

Commits

• 02c29ef Counters: add sync-ops, async-ops, and how long a server has been connected (...
• 8476651 Add IConnectionMultiplexer.ServerMaintenanceEvent (#2306)
• f3ac74a Fix #2249: Handle fail on cluster node responses appropriately (#2288)
• 9af4b75 Cluster: Proactively reconfigure when we hit a MOVED response (#2286)
• f8303a6 2.6.80 Release notes
• e2e4c19 Update README to reflect heartbeatInterval which applies only to async (#2284)
• 5263608 Dependencies: remove System.Diagnostics.PerformanceCounter (#2285)
• ae28ae6 Internals Rename: *Wrapper -> "KeyPrefixed" (#2282)
• c76e9ae Tests: align naming for easier finding, etc. (#2280)
• e6bd161 custom tunnel should not break ConfigurationOptions.ToString()
• Additional commits viewable in compare view

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