Upgrade error from 21.0.7 to 22.2.3-FIXED

EDITED:
Turns out my host was lying to me, the server was actually running PHP 5.x. Their cPanel was showing that I was running 7.4. I’ve upgraded the server to run 7.4 and verified it. I got past the error I listed below.
END EDIT

I’m on a hosted server, running PHP 7.4, trying to upgrade NextCloud and I’m getting an error. There isn’t much information but here is what I have:
Current version is 21.0.7.
Update to Nextcloud 22.2.3 available. (channel: “stable”)
Following file will be downloaded automatically: https://download.nextcloud.com/server/releases/nextcloud-22.2.3.zip
Open changelog :arrow_upper_right:

  • Move new files in place

<br />
<b>Parse error</b>:  syntax error, unexpected '?' in <b>/home2/bunyip/my.ibunyip.com/updater/index.php</b> on line <b>180</b><br />```

here's the relevant PHP code in index.php, lines 176-184:
	/** @var array $CONFIG */
	require_once $configFileName;
	$this->configValues = $CONFIG;

	if (php_sapi_name() !== 'cli' && ($this->configValues['upgrade.disable-web'] ?? false)) {
		// updater disabled
		$this->disabled = true;
		return;
	}

I have looked at the Installation manual, the server requirements state that I can run PHP 7.3, 7.4 or 8.0.  I'm running 7.4   I just checked with my host, they don't (yet) support PHP 8.0, so I can't upgrade to 8.

Anyone have any suggestions?