chore(deps): update mcr.microsoft.com/dotnet/sdk docker tag to v9

| datasource | package                      | from | to  |
| ---------- | ---------------------------- | ---- | --- |
| docker     | mcr.microsoft.com/dotnet/sdk | 8.0  | 9.0 |

Dockerfile

@@ -1,5 +1,5 @@
 # Set the base image as the .NET 8.0 SDK (this includes the runtime)
-FROM mcr.microsoft.com/dotnet/sdk:8.0 as build-env
+FROM mcr.microsoft.com/dotnet/sdk:9.0 as build-env
 
 # Copy everything and publish the release (publish implicitly restores and builds)
 COPY . ./
@@ -14,6 +14,6 @@ LABEL homepage="https://github.com/KinsonDigital/VersionMiner"
 LABEL com.github.actions.name="Version Miner"
 
 # Relayer the .NET SDK, anew with the build output
-FROM mcr.microsoft.com/dotnet/sdk:8.0
+FROM mcr.microsoft.com/dotnet/sdk:9.0
 COPY --from=build-env /out .
 ENTRYPOINT [ "dotnet", "/VersionMiner.dll" ]