Ubuntu-22.04 Repo added - Warning about Non-LTS Ubuntu can be removed

Due to this closed issue (saltstack/salt#62202), the warning * WARN: Non-LTS Ubuntu detected, but stable packages requested. Trying packages for previous LTS release. You may experience problems. can be removed and the fallback variables are not needed anymore for the case "$DISTRO_MAJOR_VERSION" -eq 22

salt-bootstrap/bootstrap-salt.sh

Lines 3025 to 3029 in 9fa32bd

    
           # remove 22 version when salt packages for 22.04 are available 
        
           [ "$DISTRO_MAJOR_VERSION" -eq 21 ] ||  [ "$DISTRO_MAJOR_VERSION" -eq 22 ]; then 
        
           echowarn "Non-LTS Ubuntu detected, but stable packages requested. Trying packages for previous LTS release. You may experience problems." 
        
           UBUNTU_VERSION=20.04 
        
           UBUNTU_CODENAME="focal"

Oh, there is already a PR for this issue: #1914

	# remove 22 version when salt packages for 22.04 are available
	[ "$DISTRO_MAJOR_VERSION" -eq 21 ] \|\| [ "$DISTRO_MAJOR_VERSION" -eq 22 ]; then
	echowarn "Non-LTS Ubuntu detected, but stable packages requested. Trying packages for previous LTS release. You may experience problems."
	UBUNTU_VERSION=20.04
	UBUNTU_CODENAME="focal"