[openstreetmap/openstreetmap-website] Update MANUAL_INSTALL.md with integration test note (PR #7139)

[Pablo Brasero]

@pablobm commented on this pull request.

Since we are at it, apt-get shows a notice that it's substituting `git-core` with `git`, and `postgres-contrib` with `postgres` (already in the list).

> @@ -131,7 +145,15 @@ We use [Bundler](https://bundler.io/) to manage the rubygems required for the pr
 ```bash
 cd openstreetmap-website
 bundle install
-```
+
+> [NOTE]
+> On Ubuntu 26.04 the provided version of bundler is old and will not install the gems, you can
+> upgrade with 
+>
+> ```bash
+> sudo bundle update --bundler
+> ```
+> however this will install the gems as root which may or may not be what you want.

There might be a better way to do this:
```
bundle config set path vendor/cache
bundle install
```
Gems will be installed on the project directory at `vendor/cache`, so this should be added to `.gitignore`.


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