cantera: migrate from Homebrew core

Closes #948.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
gromacs: migrate from Homebrew core

Closes #947.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
sundials: migrate from Homebrew core

Closes #946.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>