feat:use local pcall

Author: beardnick

apisix/plugins/openid-connect.lua

@@ -24,6 +24,7 @@ local string  = string
 local ngx     = ngx
 local ipairs  = ipairs
 local type    = type
+local pcall   = pcall
 local concat  = table.concat
 
 local ngx_encode_base64 = ngx.encode_base64