chore: reduce repetition of go versions

when we cut a new release of descheduler, we have to update the go version in multiple places
which presents an opportunity to miss updating one.

Signed-off-by: Amir Alavi <amiralavi7@gmail.com>

hack/update-gofmt.sh

@@ -20,13 +20,9 @@ set -o nounset
 set -o pipefail
 
 DESCHEDULER_ROOT=$(dirname "${BASH_SOURCE}")/..
+source "${DESCHEDULER_ROOT}/hack/lib/go.sh"
 
-GO_VERSION=($(go version))
-
-if [[ -z $(echo "${GO_VERSION[2]}" | grep -E 'go1.18|go1.19|go1.20|go1.21|go1.22') ]]; then
-  echo "Unknown go version '${GO_VERSION[2]}', skipping gofmt."
-  exit 1
-fi
+go::verify_version
 
 cd "${DESCHEDULER_ROOT}"