Backport of 93d4c9e from main

Backport of 970f61f from main

Auto-created table of contents entries for all domain objects (e.g.
functions, classes, attributes, etc.) were added in Sphinx 5.2, see
sphinx-doc/sphinx#6316.

An option to control new table of contents entries was added in Sphinx
5.2.3, see sphinx-doc/sphinx#10886.
Backport of 279967e from main

Backport of 34b3288 from main

Backport of 1df963a from main

Backport of d8e1442 from main

Backport of 694cf45 from main.

…on SQLite 3.37+.

Use FlexibleFieldLookupDict which is case-insensitive mapping because
SQLite 3.37+ returns some data type names upper-cased e.g. TEXT.
Backport of 974e3b8 from main

…s for Accept-Language.

The parsed values of Accept-Language headers are cached in order to
avoid repetitive parsing. This leads to a potential denial-of-service
vector via excessive memory usage if the raw value of Accept-Language
headers is very large.

Accept-Language headers are now limited to a maximum length in order
to avoid this issue.