Fixes binary build warnings such as 

https://github.com/zed-industries/zed/actions/runs/6980107733/job/18994693722#step:5:9

```
warning: output filename collision.
The bin target `dotenv` in package `collab2 v0.28.0 (/Users/administrator/actions-runner-1/_work/zed/zed/crates/collab2)` has the same output filename as the bin target `dotenv` in package `collab v0.28.0 (/Users/administrator/actions-runner-1/_work/zed/zed/crates/collab)`.
Colliding filename is: /Users/administrator/actions-runner-1/_work/zed/zed/target/debug/dotenv
The targets should have unique names.
Consider changing their names to be unique or compiling them separately.
This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
warning: output filename collision.
The bin target `dotenv` in package `collab2 v0.28.0 (/Users/administrator/actions-runner-1/_work/zed/zed/crates/collab2)` has the same output filename as the bin target `dotenv` in package `collab v0.28.0 (/Users/administrator/actions-runner-1/_work/zed/zed/crates/collab)`.
Colliding filename is: /Users/administrator/actions-runner-1/_work/zed/zed/target/debug/dotenv.dSYM
The targets should have unique names.
Consider changing their names to be unique or compiling them separately.
This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
warning: output filename collision.
The bin target `seed` in package `collab2 v0.28.0 (/Users/administrator/actions-runner-1/_work/zed/zed/crates/collab2)` has the same output filename as the bin target `seed` in package `collab v0.28.0 (/Users/administrator/actions-runner-1/_work/zed/zed/crates/collab)`.
Colliding filename is: /Users/administrator/actions-runner-1/_work/zed/zed/target/debug/seed
The targets should have unique names.
Consider changing their names to be unique or compiling them separately.
This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
warning: output filename collision.
The bin target `seed` in package `collab2 v0.28.0 (/Users/administrator/actions-runner-1/_work/zed/zed/crates/collab2)` has the same output filename as the bin target `seed` in package `collab v0.28.0 (/Users/administrator/actions-runner-1/_work/zed/zed/crates/collab)`.
Colliding filename is: /Users/administrator/actions-runner-1/_work/zed/zed/target/debug/seed.dSYM
The targets should have unique names.
Consider changing their names to be unique or compiling them separately.
This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
```

by suffixing the collab2 binaries with `2`.

Release Notes:

- N/A