Do not print out curl verbose output (elastic#7917) (elastic#7923)

(cherry picked from commit 375e189)

Co-authored-by: Shaunak Kashyap <[email protected]>

Author: mergify[bot]

.buildkite/scripts/steps/fleet.sh

@@ -45,7 +45,6 @@ function install_fleet_packages() {
   fi
 
   resp=$(curl \
-    -v \
     -s \
     --fail-with-body \
     -X "POST" \