Update to .net9 sdk

[jviau]

DO NOT MERGE YET

The SDK change has a tangible impact to our artifacts. With 8.0.101 SDK we have some OOB packages pinned ahead of the runtime, which leads to those assemblies being explicitly included (example: System.Text.Json). When updating the SDK, the runtime is now ahead or same version as our package ref's and they are then excluded from our outputs. This will have a downstream impact if the hosted environments do not have a new enough runtime to match our requested OOB packages. We should first verify Antares and linux images have the latest .net8 runtime installed before merging this PR.

Issue describing the changes in this PR

resolves #issue_for_this_pr

Pull request checklist

IMPORTANT: Currently, changes must be backported to the in-proc branch to be included in Core Tools and non-Flex deployments.

• Backporting to the in-proc branch is not required
  • Otherwise: Link to backporting PR -- TODO
• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
• My changes should not be added to the release notes for the next release
  • Otherwise: I've added my notes to release_notes.md
• My changes do not need to be backported to a previous version
  • Otherwise: Backport tracked by issue/PR #issue_or_pr
• My changes do not require diagnostic events changes
  • Otherwise: I have added/updated all related diagnostic events and their documentation (Documentation issue linked to PR)
• I have added all required tests (Unit tests, E2E tests)

Additional information

Updates to .net9 SDK which addresses a restore issue with r2r.

deps.json changes:

Previous file: C:\repos\func\host-2\out\bin\WebJobs.Script.Tests\debug\Microsoft.Azure.WebJobs.Script.WebHost.deps.json
New file:      C:\repos\func\host-2\out\bin\WebJobs.Script.WebHost\debug\Microsoft.Azure.WebJobs.Script.WebHost.deps.json

  Changed:

  Removed:
    - System.Text.Json.dll: 8.0.0.0/8.0.1024.46610

  Added:

Additional questions

[fabiocav]

The removal flagged seems like a bug with the validation.

It's actually possible this will differ in other environments.

[fabiocav]

Removed approval while we discuss potential problems with the change.

Capturing: We cannot bump 8.x ahead of the managed environments as this wouldn't be safe (that change is what leads to the STJ difference flagged above). The 9.x dependency is fine now, but the same applies with future updates.