Great Lakes improvement (#3681)

## Description:

I found a better dataset of the region so: 
Update of the Great lakes with better terrain and more accurate water.
Nations and map size all stay the same.

<img width="918" height="306" alt="image"
src="https://github.com/user-attachments/assets/a4a68727-662f-4603-b61c-9969a2a35500"
/>

Describe the PR.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

tri.star1011

resources/maps/greatlakes/manifest.json

@@ -1,17 +1,17 @@
 {
   "map": {
     "height": 1300,
-    "num_land_tiles": 1937747,
+    "num_land_tiles": 1938066,
     "width": 2000
   },
   "map16x": {
     "height": 325,
-    "num_land_tiles": 117039,
+    "num_land_tiles": 115505,
     "width": 500
   },
   "map4x": {
     "height": 650,
-    "num_land_tiles": 478743,
+    "num_land_tiles": 476669,
     "width": 1000
   },
   "name": "greatlakes",