fix: proper parsing of string expressions that contain foo.bar:value

[sstroemer]

This pull request includes several changes to the src/core/expression.jl, test/Manifest.toml, and various test files to enhance functionality and fix issues. The most important changes include improvements to the _string_to_fevalexpr function, updates to dependencies in the Manifest.toml file, and the addition of new test cases for specific issues.

Improvements to _string_to_fevalexpr function:

• Proper parsing of string expressions that contain foo.bar:value, by peeking ahead when encountering a ..

Dependency updates:

• Updated versions for several dependencies in test/Manifest.toml including HiGHS, JuMP, JuliaInterpreter, LoweredCodeUtils, and OrderedCollections. [1] [2] [3] [4] [5]

Test improvements:

• Added new test set for IESopt.jl fixes in test/runtests.jl.
• Moved issue-specific test cases from test/src/basic.jl to a new file test/src/issues.jl. [1] [2]
• Added new configuration and template files for issue [Bug] Failing to parse correct component name in expression for a Decision in a template #38 in test/test_files/issues/38. [1] [2]

[sstroemer]

Fixes #38