chore: update .NET SDK versions in Dockerfile and global.json

[v-vajakkala]

Description

Describe the changes in this PR.

Related issues

To fix vulnerabilities for [AB#205761] (https://dev.azure.com/microsofthealth/Health/_workitems/edit/205761)

Testing

Describe how this change was tested.

FHIR Team Checklist

• Update the title of the PR to be succinct and less than 65 characters
• Add a milestone to the PR for the sprint that it is merged (i.e. add S47)
• Tag the PR with the type of update: Bug, Build, Dependencies, Enhancement, New-Feature or Documentation
• Tag the PR with Open source, Azure API for FHIR (CosmosDB or common code) or Azure Healthcare APIs (SQL or common code) to specify where this change is intended to be released.
• Tag the PR with Schema Version backward compatible or Schema Version backward incompatible or Schema Version unchanged if this adds or updates Sql script which is/is not backward compatible with the code.
• When changing or adding behavior, if your code modifies the system design or changes design assumptions, please create and include an ADR.
• CI is green before merge
• Review squash-merge requirements

Semver Change (docs)

Patch|Skip|Feature|Breaking (reason)

[Codecov Comments Bot (codecov-commenter)]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.86%. Comparing base (c761d5a) to head (19a03d1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5777      +/-   ##
==========================================
- Coverage   78.88%   78.86%   -0.02%     
==========================================
  Files        1016     1016              
  Lines       36856    36856              
  Branches     5612     5612              
==========================================
- Hits        29074    29068       -6     
- Misses       6404     6409       +5     
- Partials     1378     1379       +1     

see 8 files with indirect coverage changes

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