User/millerds/update sharedruntime repos

[millerds]

Thank you for your pull request. Please provide the following information.

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Updating the repo references for the SharedRuntime templates to point to new repos insteado of branches. 

1. Do these changes impact User Experience? (e.g., how the user interacts with Yo Office and/or the files and folders the user sees in the project that Yo Office creates)

   • [x] Yes
   • [ ] No

2. Do these changes impact documentation? (e.g., a tutorial on https://learn.microsoft.com/en-us/office/dev/add-ins/overview/office-add-ins)

   • [ ] Yes
   • [x] No

3. Validation/testing performed:

   Describe manual testing done.

4. Platforms tested:

   • [x] Windows
   • [ ] Mac