chore: update test matrix

[lowlydba]

Description

Add stable 2.16 to test matrix

How Has This Been Tested?

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue) - Fixes #
• [ ] New feature (non-breaking change which adds functionality)

Checklist:

• [ ] I have read/followed the CONTRIBUTING document.
• [ ] I have read/followed the PR Quick Start Guide
• [ ] I have added tests to cover my changes or they are N/A.
• [ ] I have added a changelog fragment describing the changes.
• [ ] New module options/parameters include a version_added property.

[codecov-commenter]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (f78faaf) 93.68% compared to head (dbdc210) 93.68%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #211 +/- ## ======================================= Coverage 93.68% 93.68% ======================================= Files 64 64 Lines 2202 2202 ======================================= Hits 2063 2063 Misses 139 139 ``` | [Flag](https://app.codecov.io/gh/lowlydba/lowlydba.sqlserver/pull/211/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=John+McCall) | Coverage Δ | | |---|---|---| | [sanity](https://app.codecov.io/gh/lowlydba/lowlydba.sqlserver/pull/211/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=John+McCall) | `100.00% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=John+McCall#carryforward-flags-in-the-pull-request-comment) to find out more.

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