Fix a type error in the Environment bootstrapper

Author: AJCStriker

package.json

@@ -1,6 +1,6 @@
 {
   "name": "strontium",
-  "version": "2.7.2",
+  "version": "2.7.3",
   "description": "Strontium is a TypeScript toolkit for High Performance API servers built for Production not Projects.",
   "main": "lib/src/index.js",
   "types": "lib/src/index.d.ts",

src/bootstrap/drivers/Environment.ts

@@ -7,7 +7,9 @@ export class Environment<O extends ObjectValidator> implements Process {
 
     constructor(private validator: O) {}
 
-    public getKey<K extends keyof ValidatedObject<O>>(key: K): O[K] {
+    public getKey<K extends keyof ValidatedObject<O>>(
+        key: K
+    ): ValidatedObject<O>[K] {
         if (this.validatedEnvironment !== undefined) {
             return this.validatedEnvironment[key]
         } else {