Update Next.js code owners (vercel#51319)

This PR updates `.vercel.approvers` files to fix some validation errors
and to more closely match desired behavior for assigning and notifying
members of the team for reviews that was discussed on an internal Slack
thread.

- Owners files for `.cargo/` and `.config/` are moved to their
respective directories instead of being placed at the root.
- Fixes the `@vercel/next-js` team name (it uses a dash instead of a
period)
- Adds `:notify` to reviewers so that all of the people listed are
notified of the pull request, but only a single person would be
requested as a reviewer.
- `@vercel/web-tooling:optional` was made optional so that they are not
requested for any change to `pnpm-lock.yaml` but still have the ability
to approve PRs that modify it.

---------

.cargo/.vercel.approvers

@@ -0,0 +1 @@
+@vercel/web-tooling

.config/.vercel.approvers

@@ -0,0 +1 @@
+nextest.toml @vercel/web-tooling

.vercel.approvers

@@ -5,14 +5,12 @@
 @huozhi
 @feedthejim
 @leerob:optional
-@vercel/next.js:optional
+@vercel/next-js:optional
 
 # Tooling & Telemetry
-pnpm-lock.yaml                                @vercel/web-tooling
+pnpm-lock.yaml                                @vercel/web-tooling:optional
 Cargo.toml                                    @vercel/web-tooling
 Cargo.lock                                    @vercel/web-tooling
-/.cargo/config.toml                           @vercel/web-tooling
-/.config/nextest.toml                         @vercel/web-tooling
 
 # Catch any markdown files outside docs (e.g. examples)
 **/*.md                                       @vercel/devex

packages/next/src/client/.vercel.approvers

@@ -1 +1,4 @@
-**/use-intersection.tsx @timneutkens @ijjk @shuding @styfle
+use-intersection.tsx @timneutkens:notify
+use-intersection.tsx @ijjk:notify
+use-intersection.tsx @shuding:notify
+use-intersection.tsx @styfle:notify

packages/next/src/server/.vercel.approvers

@@ -1,2 +1,10 @@
-**/serve-static.ts         @timneutkens @ijjk @shuding @styfle @huozhi
-**/config.ts               @timneutkens @ijjk @shuding @styfle @huozhi
+config.ts               @timneutkens:notify
+config.ts               @ijjk:notify
+config.ts               @shuding:notify
+config.ts               @styfle:notify
+config.ts               @huozhi:notify
+serve-static.ts         @timneutkens:notify
+serve-static.ts         @ijjk:notify
+serve-static.ts         @shuding:notify
+serve-static.ts         @styfle:notify
+serve-static.ts         @huozhi:notify

packages/next/src/server/lib/squoosh/.vercel.approvers

@@ -1,4 +1,4 @@
-@timneutkens
-@ijjk
-@shuding
-@styfle
+@timneutkens:notify
+@ijjk:notify
+@shuding:notify
+@styfle:notify