Merge 06d37f40ee into 9c550dd5a1

Bumps [tj-actions/changed-files](https://github.com/tj-actions/changed-files) from 45.0.4 to 45.0.5.
- [Release notes](https://github.com/tj-actions/changed-files/releases)
- [Changelog](https://github.com/tj-actions/changed-files/blob/main/HISTORY.md)
- [Commits](https://github.com/tj-actions/changed-files/compare/v45.0.4...v45.0.5)

---
updated-dependencies:
- dependency-name: tj-actions/changed-files
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/check-urls.yml

@@ -42,7 +42,7 @@ jobs:
           fetch-depth: ${{ steps.set-params.outputs.fetch-depth }}
       - name: Get changed files
         id: changed-files
-        uses: tj-actions/changed-files@v45.0.4
+        uses: tj-actions/changed-files@v45.0.5
         with:
           separator: " "
           json: true

books/free-programming-books-zh.md

@@ -336,6 +336,8 @@
 * [100个gcc小技巧](https://github.com/hellogcc/100-gcc-tips/blob/master/src/index.md)
 * [100个gdb小技巧](https://github.com/hellogcc/100-gdb-tips/blob/master/src/index.md)
 * [简单易懂的C魔法](https://web.archive.org/web/20210413213859/http://www.nowamagic.net/librarys/books/contents/c) *(:card_file_box: archived)*
+* [现代 C++ 并发编程教程](https://github.com/Mq-b/ModernCpp-ConcurrentProgramming-Tutorial/tree/main/md)
+* [现代 C++ 模板教程](https://github.com/Mq-b/Modern-Cpp-templates-tutorial/tree/main/md)
 * [現代 C++ 101](https://hackmd.io/@lumynou5/CppTutorial-zh-tw) - Lumynous (:construction: *in process*)
 * [像计算机科学家一样思考（C++版)](http://www.ituring.com.cn/book/1203) (《How To Think Like a Computer Scientist: C++ Version》中文版)
 * [C 语言编程透视](https://tinylab.gitbooks.io/cbook/content/)