[deps]: Update Serilog.Sinks.File to v7 (#392)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

version-bump/tests/fixtures/test.csproj

@@ -32,7 +32,7 @@
     <PackageReference Include="Serilog.AspNetCore" Version="[8.0.3]" />
     <PackageReference Include="Serilog.Settings.Configuration" Version="[8.0.4]" />
     <PackageReference Include="Serilog.Sinks.Console" Version="[6.0.0]" />
-    <PackageReference Include="Serilog.Sinks.File" Version="[6.0.0]" />
+    <PackageReference Include="Serilog.Sinks.File" Version="[7.0.0]" />
     <PackageReference Include="VaultSharp" Version="[1.17.5.1]" />
   </ItemGroup>