fix: Fix show_system_resource parsing

fix(firewall.show_system_resources): Parse result with unlimited number of whitespaces between 'KiB Mem :' and the next value (#280)

Co-authored-by: Kevin Bannier <[email protected]>

panos/firewall.py

@@ -386,7 +386,7 @@ def show_system_resources(self):
         result = self.xapi.xml_root()
         if self._version_info >= (9, 0, 0):
             regex = re.compile(
-                r"load average: ([\d\.]+).*? ([\d\.]+) id,.*KiB Mem : (\d+) total,.*? (\d+) free",
+                r"load average: ([\d\.]+).*? ([\d\.]+) id,.*KiB Mem :\s+(\d+) total,.*? (\d+) free",
                 re.DOTALL,
             )
         else: