chore: add installation of system libs for pymssql in CI

- mssql tests were failing with the error:
  ```
   fatal error: sqlfront.h: No such file or directory
  ```
- fix this by installing `freetds-dev` (and build-essentials)
  so `pymssql` can compile against the FreeTDS headers.
- pin pymssql upto 2.3.2 to fix error:
  ```
  pymssql (2.3.2) not supporting PEP 517 builds
  ```

Author: Lukas Alberto Belck

.github/workflows/main.yml

@@ -79,6 +79,10 @@ jobs:
               uses: actions/setup-python@v4
               with:
                   python-version: ${{ matrix.python-version }}
+            - name: Install system libs for pymssql
+              run: |
+                    sudo apt-get update
+                    sudo apt-get install --yes build-essential freetds-dev freetds-bin
             - name: Install Project
               run: |
                   python -m pip install --upgrade pip

pyproject.toml

@@ -37,7 +37,7 @@ flexmock = ">=0.9.7"
 psycopg2-binary = ">=2.4.6"
 PyMySQL = ">=0.8.0"
 sqlalchemy_i18n = "*"
-pymssql = ">=2.2.0"
+pymssql = ">=2.2.0,<2.3.2"
 cx-Oracle = "8.3.0"
 pytest-cov = "*"