Add support of slurm-26.05

[ohtanim]

Description of Change

Added support for Slurm v26.05. The Slurm library(libslurm.so) interface changed as of v26.05, so our spank plugin currently fails to build with the following error. This PR introduces conditional compilation referring to SLURM_VERSION_NUMBER to support both v26.05 and older versions.

/shared/spank-plugins/plugins/spank_qrmi/spank_qrmi.c:560:43: error: incompatible type for argument 2 of ‘slurm_load_job’
  560 |         if (slurm_load_job(&job_info_msg, job_id, SHOW_DETAIL) == SLURM_SUCCESS) {
      |                                           ^~~~~~
      |                                           |
      |                                           uint32_t {aka unsigned int}
In file included from /shared/spank-plugins/plugins/spank_qrmi/spank_qrmi.c:26:
/usr/include/slurm/slurm.h:4256:66: note: expected ‘slurm_step_id_t’ but argument is of type ‘uint32_t’ {aka ‘unsigned int’}
 4256 | extern int slurm_load_job(job_info_msg_t **resp, slurm_step_id_t step_id,
      |                                                  ~~~~~~~~~~~~~~~~^~~~~~~

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[awennersteen]

Lgtm

Thanks for catching