use newest gms in github action; fail on codeCheck warning; test that no line starts with ****

[orichters]

Purpose of this PR

• avoid that old gms version is used as here where it is obvious through convetions being printed that the version is older than Jun 2022
• in tests, fail on codeCheck warnings
• add test that no lines starting with **** are in the code to avoid Remove four asterisks in code comments (reserved for GAMS error messages) #1571

Failure:

-- Testing test_99-codeCheck.R ---------------------------------------------------
[ FAIL 1 | WARN 1 | SKIP 0 | PASS 1 ]

-- Warning (test_99-codeCheck.R:25:7): No four asterisks in code ---------------
The following lines start with four asterisks, reserved for GAMS error messages.
../../core/datainput.gms:**** |  (C) 2006-2023 Potsdam Institute for Climate Impact Research (PIK)

-- Failure (test_99-codeCheck.R:28:5): No four asterisks in code ---------------
length(starlines) == 0 is not TRUE

`actual`:   FALSE
`expected`: TRUE
[ FAIL 1 | WARN 1 | SKIP 0 | PASS 1 ]

grep not available:

-- Testing test_99-codeCheck.R ----------------------------------------------------------------------
[ FAIL 0 | WARN 0 | SKIP 1 | PASS 1 ]

-- Skipped tests (1) ------------------------------------------------
• 'grep' not available, please check yourself whether code starts with four asterisks. (1): test_99-codeCheck.R:19:5

Everything fine:

-- Testing test_99-codeCheck.R ----------------------------------------------------------------------
[ FAIL 0 | WARN 0 | SKIP 0 | PASS 2 ] Done!

Type of change

• Bug fix

Checklist:

• I explained my changes within the PR, particularly in hard-to-understand areas
• All automated model tests pass (FAIL 0 in the output of make test) [ FAIL 0 | WARN 0 | SKIP 6 | PASS 82 ]