Update glam requirement from 0.18.0 to 0.19.0

Updates the requirements on [glam](https://github.com/bitshifter/glam-rs) to permit the latest version.
- [Release notes](https://github.com/bitshifter/glam-rs/releases)
- [Changelog](https://github.com/bitshifter/glam-rs/blob/main/CHANGELOG.md)
- [Commits](bitshifter/glam-rs@0.18.0...0.19.0)

---
updated-dependencies:
- dependency-name: glam
  dependency-type: direct:production
...

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

Author: dependabot[bot]

examples/scene_create/Cargo.toml

@@ -10,4 +10,4 @@ crate-type = ["cdylib"]
 
 [dependencies]
 gdnative = { path = "../../gdnative" }
-glam = "0.18.0"
+glam = "0.19.0"

gdnative-core/Cargo.toml

@@ -23,7 +23,7 @@ ahash = "=0.7.4" # TODO use flexible version as soon as https://github.com/tkait
 approx = "0.5.0"
 atomic-take = "1.0.0"
 bitflags = { version = "1.2.1", optional = true }
-glam = "0.18.0"
+glam = "0.19.0"
 indexmap = "1.7.0"
 libc = "0.2.98"
 once_cell = "1.8.0"