Dependabot supports .NET SDK updates [GA] (#53007)

Co-authored-by: Kevin Heis <heiskr@users.noreply.github.com>

data/features/dependabot-dotnet-sdk.yml

@@ -0,0 +1,5 @@
+# Reference: issue  #4982
+versions:
+  fpt: '*'
+  ghec: '*'
+  ghes: '>=3.16'

data/reusables/dependabot/supported-package-managers.md

@@ -8,6 +8,9 @@ Composer       | `composer`       | v1, v2           | {% octicon "check" aria-l
 | {% endif %} |
 | {% ifversion dependabot-version-updates-enhanced-docker-support %} |
 [Docker](#docker){% else %}Docker{% endif %}         | `docker`         | v1               | {% octicon "check" aria-label="Supported" %} | {% octicon "x" aria-label="Not supported" %} | {% octicon "check" aria-label="Supported" %} | {% octicon "check" aria-label="Supported" %} | Not applicable |
+| {% ifversion dependabot-dotnet-sdk %} |
+.NET SDK       | `dotnet-sdk`         | >=.NET Core 3.1           | {% octicon "check" aria-label="Supported" %} | {% octicon "x" aria-label="Not supported" %} | Not applicable | Not applicable | Not applicable |
+| {% endif %} |
 Hex            | `mix`            | v1               | {% octicon "check" aria-label="Supported" %} | {% octicon "x" aria-label="Not supported" %} | {% octicon "x" aria-label="Not supported" %} | {% octicon "check" aria-label="Supported" %} | {% octicon "x" aria-label="Not supported" %} |
 elm-package    | `elm`            | v0.19            | {% octicon "check" aria-label="Supported" %} | {% octicon "x" aria-label="Not supported" %} | {% octicon "check" aria-label="Supported" %} | {% octicon "check" aria-label="Supported" %} | {% octicon "x" aria-label="Not supported" %} |
 git submodule  | `gitsubmodule`   | Not applicable | {% octicon "check" aria-label="Supported" %} | {% octicon "x" aria-label="Not supported" %} | {% octicon "check" aria-label="Supported" %} | {% octicon "check" aria-label="Supported" %} | Not applicable |