Update rspirv requirement from 0.6.0 to 0.7.0 (#7)

Updates the requirements on [rspirv](https://github.com/gfx-rs/rspirv) to permit the latest version.
- [Release notes](https://github.com/gfx-rs/rspirv/releases)
- [Commits](https://github.com/gfx-rs/rspirv/commits)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -37,4 +37,4 @@ winapi = { version = "0.3.9", features = ["wtypes", "oleauto", "combaseapi"] }
 libc = "0.2"
 
 [dev-dependencies]
-rspirv = "0.6.0"
+rspirv = "0.7.0"