Math tests fix (#12748)

# Objective

Fixes `cargo test -p bevy_math` as in #12729.

## Solution

As described in
[message](#12729 (comment))
Added workaround `bevy_math = { path = ".", version = "0.14.0-dev",
features = ["approx"] }` to `bevy_math`'s `dev-dependencies`

---------

Co-authored-by: BD103 <59022059+BD103@users.noreply.github.com>

Author: bugsweeper

crates/bevy_math/Cargo.toml

@@ -23,6 +23,8 @@ approx = "0.5"
 # Supply rngs for examples and tests
 rand = "0.8"
 rand_chacha = "0.3"
+# Enable the approx feature when testing.
+bevy_math = { path = ".", version = "0.14.0-dev", features = ["approx"] }
 
 [features]
 default = ["rand"]