ConversionUtils().bgp_as_is_valid(): Fix PEP8 bare except

plugins/module_utils/common/conversion.py

@@ -80,7 +80,7 @@ def bgp_as_is_valid(self, value):
             return False
         try:
             asn = str(value)
-        except:
+        except UnicodeEncodeError:
             msg = f"BGP ASN ({value}) could not be converted to a string."
             self.bgp_as_invalid_reason = msg
             return False