CI: Install DCW and GSHHG data in the "GMT Dev Tests" workflow

[seisman]

Description of proposed changes

Sometimes the "GMT Dev Tests workflow" fails with errors like:

Error:  GMTCLibError("Module 'coast' failed with status code 74:\ncoast [ERROR]: Cannot open file /Users/runner/.gmt/geography/dcw/dcw-gmt.nc!\ncoast [ERROR]: South is outside -90 to +90 degree range\ncoast [ERROR]: General map projection error")
Traceback (most recent call last):
  File "/Users/runner/micromamba/envs/pygmt/lib/python3.12/doctest.py", line 1368, in __run
    exec(compile(example.source, filename, "single",
  File "<doctest pygmt.clib.session.Session.extract_region[6]>", line 1, in <module>
  File "/Users/runner/work/pygmt/pygmt/pygmt/helpers/decorators.py", line 609, in new_module
    return module_func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/runner/work/pygmt/pygmt/pygmt/helpers/decorators.py", line 773, in new_module
    return module_func(*bound.args, **bound.kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/runner/work/pygmt/pygmt/pygmt/src/coast.py", line 203, in coast
    lib.call_module(module="coast", args=build_arg_list(kwargs))
  File "/Users/runner/work/pygmt/pygmt/pygmt/clib/session.py", line 655, in call_module
    raise GMTCLibError(
pygmt.exceptions.GMTCLibError: Module 'coast' failed with status code 74:
Error: ERROR]: Cannot open file /Users/runner/.gmt/geography/dcw/dcw-gmt.nc!
Error: ERROR]: South is outside -90 to +90 degree range
Error: ERROR]: General map projection error

GMT will download the DCW and GSHHG datasets if they are not installed. The download may fail and cause errors like above.

[seisman]

This doesn't work on Windows.

[seisman]

It seems compiling gshhg_version fails on Windows:

CMake Error at cmake/modules/FindGSHHG.cmake:70 (message):
  Cannot determine GSHHG version:


  			Change Dir: 'D:/a/pygmt/pygmt/gmt/build/CMakeTmp/CMakeFiles/CMakeTmp'


  Run Build Command(s):
  C:/Users/runneradmin/micromamba/envs/pygmt/Library/bin/ninja.exe -v
  cmTC_165d0

  [1/2]
  C:\PROGRA~1\MICROS~2\2022\ENTERP~1\VC\Tools\MSVC\1441~1.341\bin\Hostx64\x64\cl.exe
  /nologo -DSTANDALONE
  -IC:\Users\runneradmin\micromamba\envs\pygmt\Library\include
  /D_CRT_NONSTDC_NO_DEPRECATE /D_SCL_SECURE_NO_DEPRECATE
  /D_CRT_SECURE_NO_WARNINGS /D_CRT_SECURE_NO_DEPRECATE /DWIN32 /D_WINDOWS
  -openmp /Zi /Ob0 /Od /RTC1 -MDd /showIncludes
  /FoCMakeFiles\cmTC_165d0.dir\gshhg_version.c.obj
  /FdCMakeFiles\cmTC_165d0.dir\ /FS -c
  D:\a\pygmt\pygmt\gmt\src\gshhg_version.c

  [2/2] C:\Windows\system32\cmd.exe /C "cd .  && "C:\Program
  Files\CMake\bin\cmake.exe" -E vs_link_exe
  --intdir=CMakeFiles\cmTC_165d0.dir
  --rc=C:\PROGRA~2\WI3CF2~1\10\bin\[100](https://github.com/GenericMappingTools/pygmt/actions/runs/11201088253/job/31135709376?pr=3486#step:7:101)226~1.0\x64\rc.exe
  --mt=C:\PROGRA~2\WI3CF2~1\10\bin\100226~1.0\x64\mt.exe --manifests --
  C:\PROGRA~1\MICROS~2\2022\ENTERP~1\VC\Tools\MSVC\1441~1.341\bin\Hostx64\x64\link.exe
  /nologo CMakeFiles\cmTC_165d0.dir\gshhg_version.c.obj /out:cmTC_165d0.exe
  /implib:cmTC_165d0.lib /pdb:cmTC_165d0.pdb /version:0.0 /machine:x64
  /MANIFEST:NO setargv.obj /debug /INCREMENTAL /subsystem:console
  C:\Users\runneradmin\micromamba\envs\pygmt\Library\lib\netcdf.lib
  kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib
  oleaut32.lib uuid.lib comdlg32.lib advapi32.lib && cd ."







  			Exit code 0xc0000135

Call Stack (most recent call first):
  src/CMakeLists.txt:325 (find_package)