Update net9 (#72)

* feat: Enhance database preparation scripts for PostgreSQL

- Added error handling in prepare-database.cmd to check for the presence of the 'psql' command.
- Introduced a new Bash script (prepare-database.sh) that provides similar functionality with improved usage instructions and error handling.
- Both scripts now support creating and erasing the sample database with clear user prompts.

* feat: Add contributing guidelines, security policy, and update README for PostgreSQL caching library

- Introduced a new CONTRIBUTING.md file outlining contribution standards and development setup.
- Added SECURITY.md to detail security policies, reporting vulnerabilities, and best practices.
- Enhanced README.md with a comprehensive introduction, installation instructions, and usage examples.
- Updated project to target .NET 6, 8, and 9, and bumped version to 5.0.0.
- Improved error handling in DatabaseExpiredItemsRemoverLoop and added logging for better diagnostics.
- Updated sample projects to reflect changes in dependencies and configurations.

* chore: Remove outdated badges from README.md

- Removed Build Status and Code Quality badges from the README.md file to streamline the documentation.
- This change reflects a shift in focus towards more relevant information for users.

* build: Update .NET Core version to 9.0.x and actions/upload-artifact to v4 in CI workflow

- Bumped the .NET Core version from 8.0.x to 9.0.x in the GitHub Actions workflow.
- Updated the upload-artifact action from v1 to v4 for improved functionality and performance.

Author: leonibr

Diff for: .github/workflows/dotnet-core.yml

@@ -14,15 +14,15 @@ jobs:
         uses: actions/setup-dotnet@v1
         with:
           dotnet-version: |
-            8.0.x
+            9.0.x
 
       - name: Install dependencies
         run: dotnet restore
       - name: Packing Nuget
         run: dotnet pack --configuration Release --no-restore /p:Version=${{ github.event.release.tag_name }} /p:PackageReleaseNotes="See https://github.com/leonibr/community-extensions-cache-postgres/releases/tag/${{ github.event.release.tag_name }}"
         working-directory: ./Extensions.Caching.PostgreSql/
       - name: Archive NuGet Package
-        uses: actions/upload-artifact@v1
+        uses: actions/upload-artifact@v4
         with:
           name: Extensions.Caching.PostgreSql
           path: ./Extensions.Caching.PostgreSql/bin/Release/Community.Microsoft.Extensions.Caching.PostgreSql.${{ github.event.release.tag_name }}.nupkg

Diff for: README.md

@@ -1,8 +1,6 @@
 # PostgreSQL Distributed Cache for .NET Core | Community Edition
 
 [![Nuget](https://img.shields.io/nuget/v/Community.Microsoft.Extensions.Caching.PostgreSql)](https://www.nuget.org/packages/Community.Microsoft.Extensions.Caching.PostgreSql)
-[![Build Status](https://img.shields.io/github/actions/workflow/status/leonibr/community-extensions-cache-postgres/dotnet.yml?branch=main)](https://github.com/leonibr/community-extensions-cache-postgres/actions/workflows/dotnet.yml)
-[![Code Quality](https://img.shields.io/codefactor/grade/github/leonibr/community-extensions-cache-postgres)](https://www.codefactor.io/repository/github/leonibr/community-extensions-cache-postgres)
 
 ## Introduction