CompatHelper: bump compat for FMI in [weakdeps] to 0.15, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the FMI package from 0.14 to 0.14, 0.15.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[github-actions]

Benchmark Results (Julia vlts)

Time benchmarks

	master	d8b0ac2...	master / d8b0ac2...
ODEProblem	0.0817 ± 0.0072 s	0.0805 ± 0.0067 s	1.01 ± 0.12
init	0.0506 ± 0.0014 ms	0.0504 ± 0.0013 ms	1 ± 0.038
large_parameter_init/ODEProblem	0.877 ± 0.004 s	0.846 ± 0.0073 s	1.04 ± 0.01
large_parameter_init/init	0.0978 ± 0.0036 ms	0.0992 ± 0.0035 ms	0.985 ± 0.051
mtkcompile	29.1 ± 0.58 ms	28.5 ± 0.81 ms	1.02 ± 0.035
time_to_load	4.94 ± 0.084 s	4.93 ± 0.047 s	1 ± 0.02

Memory benchmarks

	master	d8b0ac2...	master / d8b0ac2...
ODEProblem	0.659 M allocs: 22.1 MB	0.659 M allocs: 22.1 MB	1
init	0.892 k allocs: 0.046 MB	0.892 k allocs: 0.046 MB	1
large_parameter_init/ODEProblem	4.21 M allocs: 0.163 GB	4.23 M allocs: 0.165 GB	0.991
large_parameter_init/init	1.74 k allocs: 0.0856 MB	1.74 k allocs: 0.0856 MB	1
mtkcompile	0.229 M allocs: 8.46 MB	0.229 M allocs: 8.46 MB	1
time_to_load	0.153 k allocs: 14.5 kB	0.153 k allocs: 14.5 kB	1

[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	master	d8b0ac2...	master / d8b0ac2...
ODEProblem	0.0924 ± 0.0064 s	0.093 ± 0.0064 s	0.994 ± 0.097
init	0.0436 ± 0.011 ms	0.0438 ± 0.011 ms	0.995 ± 0.35
large_parameter_init/ODEProblem	1.15 ± 0.037 s	1.16 ± 0.031 s	0.999 ± 0.042
large_parameter_init/init	0.077 ± 0.017 ms	0.0774 ± 0.017 ms	0.994 ± 0.31
mtkcompile	0.0337 ± 0.00066 s	0.034 ± 0.0013 s	0.989 ± 0.043
time_to_load	4.61 ± 0.017 s	4.61 ± 0.035 s	1 ± 0.0085

Memory benchmarks

	master	d8b0ac2...	master / d8b0ac2...
ODEProblem	0.673 M allocs: 22.2 MB	0.673 M allocs: 22.1 MB	1
init	0.797 k allocs: 30.5 kB	0.797 k allocs: 30.5 kB	1
large_parameter_init/ODEProblem	4.47 M allocs: 0.164 GB	4.49 M allocs: 0.166 GB	0.989
large_parameter_init/init	1.64 k allocs: 0.0594 MB	1.64 k allocs: 0.0594 MB	1
mtkcompile	0.234 M allocs: 8 MB	0.234 M allocs: 8 MB	1
time_to_load	0.149 k allocs: 11.1 kB	0.149 k allocs: 11.1 kB	1