docs: add mongoose 8 to mongodb server compatibility guide

Fix #14064

Author: vkarpov15

docs/compatibility.md

@@ -16,19 +16,19 @@ You can refer to [this table](https://www.mongodb.com/docs/drivers/node/current/
 
 Below are the [semver](http://semver.org/) ranges representing which versions of mongoose are compatible with the listed versions of MongoDB server.
 
-| MongoDB Server |           Mongoose            |
-| :------------: | :---------------------------: |
-|     `7.x`      |           `^7.4.0`            |
-|     `6.x`      |      `^6.5.0 \| ^7.0.0`       |
-|     `5.x`      |      `^6.0.0 \| ^7.0.0`       |
-|    `4.4.x`     | `^5.10.0 \| ^6.0.0 \| ^7.0.0` |
-|    `4.2.x`     | `^5.7.0 \| ^6.0.0 \| ^7.0.0`  |
-|    `4.0.x`     | `^5.2.0 \| ^6.0.0 \| ^7.0.0`  |
-|    `3.6.x`     | `^5.0.0 \| ^6.0.0 \| ^7.0.0`  |
-|    `3.4.x`     |      `^4.7.3 \| ^5.0.0`       |
-|    `3.2.x`     |      `^4.3.0 \| ^5.0.0`       |
-|    `3.0.x`     | `^3.8.22 \| ^4.0.0 \| ^5.0.0` |
-|    `2.6.x`     | `^3.8.8 \| ^4.0.0 \| ^5.0.0`  |
-|    `2.4.x`     |      `^3.8.0 \| ^4.0.0`       |
+| MongoDB Server |                Mongoose                 |
+| :------------: | :-------------------------------------: |
+|     `7.x`      |            `^7.4.0 | ^8.0.0`            |
+|     `6.x`      |      `^6.5.0 \| ^7.0.0 \| ^8.0.0`       |
+|     `5.x`      |      `^6.0.0 \| ^7.0.0 \| ^8.0.0`       |
+|    `4.4.x`     | `^5.10.0 \| ^6.0.0 \| ^7.0.0 \| ^8.0.0` |
+|    `4.2.x`     | `^5.7.0 \| ^6.0.0 \| ^7.0.0 \| ^8.0.0`  |
+|    `4.0.x`     | `^5.2.0 \| ^6.0.0 \| ^7.0.0 \| ^8.0.0`  |
+|    `3.6.x`     | `^5.0.0 \| ^6.0.0 \| ^7.0.0 \| ^8.0.0`  |
+|    `3.4.x`     |            `^4.7.3 \| ^5.0.0`           |
+|    `3.2.x`     |            `^4.3.0 \| ^5.0.0`           |
+|    `3.0.x`     |        `^3.8.22 \| ^4.0.0 \| ^5.0.0`    |
+|    `2.6.x`     |        `^3.8.8 \| ^4.0.0 \| ^5.0.0`     |
+|    `2.4.x`     |              `^3.8.0 \| ^4.0.0`         |
 
 Note that Mongoose `5.x` dropped support for all versions of MongoDB before `3.0.0`. If you need to use MongoDB `2.6` or older, use Mongoose `4.x`.