Update sbv & singletons for GHC MR !11112

GHC MR !11112 makes it so that one needs to enable the (new)
TypeAbstractions extension in order to use type applications in
constructor patterns. The old behaviour (ScopedTypeVariables + TypeApplications)
is still supported, but it emits a warning, which causes sbv to fail
to build due to -Werror.

In addition, the changes in GHC MR !11112 mean that the use of invisible
binders in type declarations requires the TypeAbstractions extension
to be enabled.