book: update zh

Updated via the `update-book.yml` GitHub workflow.

Author: ttaylorr

external/book/content/book/zh/v2/_index.html

@@ -8,7 +8,7 @@
   language_code: zh
   front_page: true
   repository_url: https://github.com/progit/progit2-zh
-  sha: f549129714ed9af3dfdaa824cbf46c5e1f23acb9
+  sha: b0c43a48f7bcf5d31eac77b96b5812b736cb8b51
   ebook_pdf: https://github.com/progit/progit2-zh/releases/download/2.1.73/progit.pdf
   ebook_epub: https://github.com/progit/progit2-zh/releases/download/2.1.73/progit.epub
   ebook_mobi: https://github.com/progit/progit2-zh/releases/download/2.1.73/progit.mobi

external/book/static/book/zh/v2/images/lifecycle.png

@@ -1 +1 @@
-f549129714ed9af3dfdaa824cbf46c5e1f23acb9
+b0c43a48f7bcf5d31eac77b96b5812b736cb8b51