Documentation of cabal and ghc version dependencies

[jpaykin]

I recently tried to install saw using the build script saw-script/build.sh following the instructions in saw-script/README.md. The build failed, which I later figured out was due to me having old versions of cabal and/or ghc (previously using cabal 2.4.1 and ghc 8.6.5). The build succeeded once I upgraded to cabal 3.4 and ghc 8.10.7 using ghcup. However, the Makefile does not contain information about what versions of cabal and/or ghc are required, and I don't know what range of versions are actually required.

I suggest adding known-to-work version numbers or ranges to the readme for future users of the tool.