[9.10] Various post-release fixes
- Bump the
haddock
submodule to bump its version number, as this was seemingly lost (see #24827) - Update
ghcup-metadata
to reflect upstream's preferences - Fix the name of
setBacktraceMechanismState
in thebase
changelog entry - Fix
upload
script to ensure that gzip files are hashed. - Backport fix for #24853 (closed)