Recently The patch 0007-Update-src-base-absl.gyp.patch was added to use
abseil as a shared library. It's something upstream recommended against
on https://github.com/google/mozc/issues/490
' For abseil, it's frequently updated, so we'd like to use the specific
version.'

Currently libabseil doesn't have a stable ABI as indicated in that
packaging commit
https://salsa.debian.org/debian/abseil/-/commit/c52743b9

Depending on a library which is going to change soname which every
upload is likely to create stability issue for mozc, wouldn't it make
sense to stick to a test version as recommended upstream?

Thanks,