Make CHANGELOG markdown

Explicitly mark the CHANGELOG as being markdown.

Update to .NET 8 (#653)

- Update to .NET 8.
- Fix new code analysis warnings.
- Use `UseArtifactsOutput=true` instead of explicitly setting the output path, as well as dropping explicit use of `--configuration` now that the default is `Release`.
- Remove `Microsoft.SourceLink.GitHub` as it is now included in the .NET SDK.
- Use `TimeProvider`.
- Use primary constructors where relevant.
- Use collection literals where relevant.
- Apply some IDE suggestions.
- Fix some typos.
- Remove `CommonAssemblyInfo`.
- Remove redundant suppressions.
- Remove field with an array to use the `char` overload of `TrimEnd()` for .NET 6+ and an inline collection literal for .NET Standard 2.0.
- Use the new MSBuild terminal logger.
- Bump version to 3.3.0.
- Bump Microsoft.Data.SqlClient to 5.1.2 for `net8.0`.

Merge pull request #503 from martincostello/bump-version

Bump version

Merge pull request #385 from martincostello/DotNet-6

Update to .NET 6

Merge pull request #428 from martincostello/Remove-net5-TFM

Remove net5.0 TFM

Merge pull request #152 from martincostello/Update-README

Update SDK version

Merge pull request #69 from martincostello/Update-xunit-logging

Update leftover reference

Merge pull request #39 from martincostello/Version-2

SqlLocalDb wrapper 2.0.0

SQL LocalDB Wrapper v1.15.0.0

SqlLocalDb v1.14.0.0