feat: 移除对 .NET 8.0/9.0 支持，仅保留 10.0/11.0

[joesdu]

📝 描述 (Description)

本次提交移除了所有 .NET 8.0 和 9.0 的兼容配置与依赖，仅保留 .NET 10.0 和 11.0。包括 CI/CD 配置、项目 TargetFrameworks 属性、相关包引用等同步调整，精简了依赖并提升了项目的版本要求。

🔗 相关问题 (Related Issues)

• Closes #
• Fixes #

🏷️ 变更类型 (Type of Change)

• 🐛 错误修复 (Bug fix) (non-breaking change which fixes an issue)
• ✨ 新功能 (New feature) (non-breaking change which adds functionality)
• 💥 破坏性变更 (Breaking change) (fix or feature that would cause existing functionality to not work as expected)
• 📚 文档更新 (Documentation update)
• 🔧 重构 (Refactor) (no functional changes)
• 🧪 测试 (Tests) (adding or updating tests)
• 🛠️ 构建/CI 变更 (Build/CI changes)
• 🎨 样式变更 (Style changes) (formatting, etc.)
• 🚀 性能改进 (Performance improvements)
• 🔒 安全改进 (Security improvements)

✅ 检查清单 (Checklist)

• 我的代码遵循项目的编码标准 (My code follows the project's coding standards)
• 我已经对自己的代码进行了自我审查 (I have performed a self-review of my own code)
• 我已经在难以理解的区域注释了我的代码 (I have commented my code, particularly in hard-to-understand areas)
• 我已经对文档进行了相应的更改 (I have made corresponding changes to the documentation)
• 我的更改不会产生新的警告或错误 (My changes generate no new warnings or errors)
• 我已经添加了证明我的修复有效或我的功能工作的测试 (I have added tests that prove my fix is effective or that my feature works)
• 新增和现有的单元测试在本地通过我的更改 (New and existing unit tests pass locally with my changes)
• 任何依赖变更都已合并并发布到下游模块 (Any dependent changes have been merged and published in downstream modules)

🧪 测试 (Testing)

• 单元测试 (Unit tests)
• 集成测试 (Integration tests)
• 手动测试 (Manual testing)
• 其他 (请指定) (Other (please specify)):

📸 截图 (如果适用) (Screenshots (if applicable))

🔍 附加说明 (Additional Notes)

[Copilot]

Pull request overview

This PR removes support for .NET 8.0 and 9.0, retaining only .NET 10.0 and 11.0 as target frameworks. This is a breaking change that simplifies the project's multi-targeting strategy and eliminates the need for backport packages like Backport.System.Threading.Lock which provided .NET 9.0+ features to .NET 8.0.

Changes:

• Updated centralized target frameworks from net8.0;net9.0;net10.0;net11.0 to net10.0;net11.0
• Removed .NET 8.0 and 9.0 from CI/CD workflows (build_test.yml and releaser.yml)
• Removed conditional package references to Backport.System.Threading.Lock for .NET 8.0

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/Directory.Build.props	Updated centralized TargetFrameworks to net10.0;net11.0 only
src/Directory.Packages.props	Removed Backport.System.Threading.Lock package version entry for net8.0
src/EasilyNET.Core/EasilyNET.Core.csproj	Removed conditional ItemGroup referencing Backport.System.Threading.Lock for net8.0
test/EasilyNET.Test.Unit/EasilyNET.Test.Unit.csproj	Updated test project TargetFrameworks and removed SuppressTfmSupportBuildWarnings
.github/workflows/releaser.yml	Removed .NET 8.0.x and 9.0.x from dotnet-version matrix
.github/workflows/build_test.yml	Removed .NET 8.0.x and 9.0.x from dotnet-version matrix