Release: 0.43.0-rc1 (#8397)

# Description

Releasing v0.43.0-rc1

This pull request includes changes to versions.yaml file to reflect the
new release candidate version.



## Type of change

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Fixes: #issue_number

## Contributor checklist
Please verify that the PR meets the following requirements, where
applicable:

- An overview of proposed schema changes is included in a linked GitHub
issue.
    - [ ] Yes
    - [ ] Not applicable
- A design document PR is created in the [design-notes
repository](https://github.com/radius-project/design-notes/), if new
APIs are being introduced.
    - [ ] Yes
    - [ ] Not applicable
- The design document has been reviewed and approved by Radius
maintainers/approvers.
    - [ ] Yes
    - [ ] Not applicable
- A PR for the [samples
repository](https://github.com/radius-project/samples) is created, if
existing samples are affected by the changes in this PR.
    - [ ] Yes
    - [ ] Not applicable
- A PR for the [documentation
repository](https://github.com/radius-project/docs) is created, if the
changes in this PR affect the documentation or any user facing updates
are made.
    - [ ] Yes
    - [ ] Not applicable
- A PR for the [recipes
repository](https://github.com/radius-project/recipes) is created, if
existing recipes are affected by the changes in this PR.
    - [ ] Yes
    - [ ] Not applicable

versions.yaml

@@ -1,4 +1,6 @@
 supported:
+  - channel: '0.43'
+    version: 'v0.43.0-rc1'
   - channel: '0.42'
     version: 'v0.42.0'
 deprecated: