Switch linkchecker to use html5ever for html parsing.

The existing regex-based HTML parsing was just too primitive to correctly handle HTML content. Some books have legitimate `href="…"` text which should not be validated because it is part of the text, not actual HTML.
rust-lang · Feb 8, 2024 · 776590b · 776590b
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commit 776590b
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diff --git a/Cargo.lock b/Cargo.lock
@@ -2274,6 +2274,7 @@ dependencies = [
 name = "linkchecker"
 version = "0.1.0"
 dependencies = [
+ "html5ever",
  "once_cell",
  "regex",
 ]

diff --git a/src/tools/linkchecker/Cargo.toml b/src/tools/linkchecker/Cargo.toml
@@ -10,3 +10,4 @@ path = "main.rs"
 [dependencies]
 regex = "1"
 once_cell = "1"
+html5ever = "0.26.0"