build: use VERSION file for storing version

This reduces the number of places to update whenever a version is bumped
and also gives us an easy way to check the current version from scripts.

Signed-

build: use VERSION file for storing version

This reduces the number of places to update whenever a version is bumped
and also gives us an easy way to check the current version from scripts.

Signed-off-by: Konrad Sztyber <konrad.sztyber@intel.com>
Change-Id: I01d7240b6e07467548c211f1e505c1e1a34360af
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/25523
Community-CI: Mellanox Build Bot
Community-CI: Community CI Samsung <spdk.community.ci.samsung@gmail.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <ben@nvidia.com>
Reviewed-by: Jim Harris <jim.harris@nvidia.com>

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