Remove version pinning from update_and_reboot

Author: hgreebe

cli/src/pcluster/resources/imagebuilder/update_and_reboot.yaml

@@ -57,21 +57,6 @@ phases:
               fi
 
               echo ${!OS}
-      - name: OperatingSystemVersion
-        action: ExecuteBash
-        inputs:
-          commands:
-            - |
-              set -v
-              FILE=/etc/os-release
-              if [ -e ${!FILE} ]; then
-                . ${!FILE}
-                echo "${!VERSION_ID}"
-              else
-                echo "The file '${!FILE}' does not exist. Failing build."
-                exit {{ FailExitCode }}
-              fi
-
 
       # Get platform name
       - name: PlatformName
@@ -166,14 +151,6 @@ phases:
               set -v
               OS='{{ build.OperatingSystemName.outputs.stdout }}'
               PLATFORM='{{ build.PlatformName.outputs.stdout }}'
-              VERSION='{{ build.OperatingSystemVersion.outputs.stdout }}'
-              if [[ ${!OS} == rhel9 ]] || [[ ${!OS} == rocky9 ]]; then
-                if [[ ! -f /etc/yum/vars/releasever ]]; then
-                  echo "yes" > /opt/parallelcluster/pin_releasesever
-                  echo ${!VERSION} > /etc/yum/vars/releasever
-                  yum clean all
-                fi
-              fi
 
               if [[ ${!PLATFORM} == RHEL ]]; then
                 yum -y install jq