Increased connection pool limits (#517)

closes https://linear.app/ghost/issue/AP-1069

- Increases connection pool limits. There were timeouts occuring due to
connection pool being exhausted.

Author: rmgpinto

src/db.ts

@@ -20,7 +20,7 @@ export const client = Knex({
           },
     pool: {
         min: 1,
-        max: 50,
+        max: 200,
     },
 });
 

src/db.unit.test.ts

@@ -11,7 +11,7 @@ describe('Knex Configuration', () => {
     it('should have correct pool settings', () => {
         expect(client.client.pool).toMatchObject({
             min: 1,
-            max: 50,
+            max: 200,
         });
     });
 });