Update HiGHS to v1.8.0

This PR includes the following: - an update of HiGHS to v1.8.0 (latest) - an update of emscripten to v3.1.71 (latest) - an update to the typings to include more (probably new?) HiGHS options To make it work, the following additional changes were made: - updates to the VSCode dev container definition to use a newer base image (Node 20, Debian Bookworm) and install the latest emscripten version - updates to the build.sh script to remove deprecated build variables, rename changed ones and add a new one. Additionally renamed deprected emscripten option EXTRA_EXPORTED_LIBS to EXPORTED_LIBS - Updates to the post.js script to auto-assume a Type of `Continuous` if no type is parsed from the output (HiGHS v1.8.0 does not include "type" column if all model variables are continuous) - Updates to the CI and Release pipelines to update all used actions to their latest versions and use emscripten v3.1.71 - Update to test.js: the test `test_empty_model` caused HiGHS v1.8.0 to (correctly) throw a model read error. The test was updated to test against a valid empty model (the objective function being a constant). If desired, the `test_empty_model` test can also be modified to assure that a model of `blah blah not a good file` throws a read error, but since there is already a test for invalid files i chose to modify it to test a valid empty model instead. The option typings update does not fix #31 (yet) since those come below https://github.com/ERGO-Code/HiGHS/blob/v1.8.0/src/lp_data/HighsOptions.h#L1123 (where i stopped adding option typings for now). Maybe if i find the time, i will also add typings for *all* advanced options.