Update dotnet releases index url

[tarunramsinghani]

Cherry Picked from #20748

Task name: DotNetCoreInstaller、UseDotNet

Description: Update dotnet releases index url

Documentation changes required: N

Added unit tests: N

Attached related issue: N

Checklist:

• Task version was bumped - please check instruction how to do it
• Checked that applied changes work as expected

[Varorbc]

Could you help me out by copying the error log? I don't have the permission to view it myself.

[tarunramsinghani]

@Varorbc, you should be able to look at the logs as anonymous user. You can try opening the pipeline in InPrivate window.

For now the error I see related to generated files not matching the original, need to run build locally and update the generated files. Committed the change

Content doesn't match /mnt/vss/_work/1/s/Tasks/DotNetCoreInstallerV1/README.md to /mnt/vss/_work/1/s/_generated/DotNetCoreInstallerV1/README.md (overwrite=true).  Dest file doesn't match source.
System.Exception: Updates needed, please run node make.js --task DotNetCoreInstallerV1 
   at BuildConfigGen.Program.ThrowWithUserFriendlyErrorToRerunWithWriteUpdatesIfVeriferError(String task, Boolean skipContentCheck) in /mnt/vss/_work/1/s/BuildConfigGen/Program.cs:line 502
   at BuildConfigGen.Program.MainUpdateTask(TaskStateStruct taskVersionState, String task, IEnumerable`1 configs, Boolean writeUpdates, Int32 currentSprint, IDebugConfigGenerator debugConfigGen, Boolean includeLocalPackagesBuildConfig, Boolean hasGlobalVersion, String generatedFolder, String altGeneratedFolder) in /mnt/vss/_work/1/s/BuildConfigGen/Program.cs:line 710
   at BuildConfigGen.Program.MainInner(String task, String configs, Nullable`1 currentSprintNullable, Boolean writeUpdates, Boolean allTasks, Boolean getTaskVersionTable, String debugAgentDir, Boolean includeLocalPackagesBuildConfig) in /mnt/vss/_work/1/s/BuildConfigGen/Program.cs:line 293
   at BuildConfigGen.Program.Main(String task, String configs, Nullable`1 currentSprint, Boolean writeUpdates, Boolean allTasks, Boolean getTaskVersionTable, String debugAgentDir, Boolean includeLocalPackagesBuildConfig) in /mnt/vss/_work/1/s/BuildConfigGen/Program.cs:line 77

[Varorbc]

@tarunramsinghani Alright, everything's good to go. Let's merge it.