Add local copy of upstreamed sphinx patch for CSS issues with EPUBs

The patch fixes https://github.com/sphinx-doc/sphinx/issues/11598
for sphinx >= 7.2.0

Signed-off-by: David Runge <dave@sleepmap.de>

book/patches/sphinx-11766.patch

@@ -0,0 +1,26 @@
+diff --git a/sphinx/builders/html/__init__.py b/sphinx/builders/html/__init__.py
+index 85067be0178..91d3647597c 100644
+--- a/sphinx/builders/html/__init__.py
++++ b/sphinx/builders/html/__init__.py
+@@ -1061,7 +1061,9 @@ def css_tag(css: _CascadingStyleSheet) -> str:
+                     attrs.append(f'{key}="{html.escape(value, quote=True)}"')
+             uri = pathto(os.fspath(css.filename), resource=True)
+             if checksum := _file_checksum(outdir, css.filename):
+-                uri += f'?v={checksum}'
++                # the EPUB format does not allow the use of query components
++                if self.name != 'epub':
++                    uri += f'?v={checksum}'
+             return f'<link {" ".join(sorted(attrs))} href="{uri}" />'
+ 
+         ctx['css_tag'] = css_tag
+@@ -1092,7 +1094,9 @@ def js_tag(js: _JavaScript | str) -> str:
+                 # https://github.com/sphinx-doc/sphinx/issues/11658
+                 pass
+             elif checksum := _file_checksum(outdir, js.filename):
+-                uri += f'?v={checksum}'
++                # the EPUB format does not allow the use of query components
++                if self.name != 'epub':
++                    uri += f'?v={checksum}'
+             if attrs:
+                 return f'<script {" ".join(sorted(attrs))} src="{uri}"></script>'
+             return f'<script src="{uri}"></script>'