Update ndarray requirement from 0.14 to 0.15

Updates the requirements on [ndarray](https://github.com/rust-ndarray/ndarray) to permit the latest version.
- [Release notes](https://github.com/rust-ndarray/ndarray/releases)
- [Changelog](https://github.com/rust-ndarray/ndarray/blob/master/RELEASES.md)
- [Commits](rust-ndarray/ndarray@0.14.0...0.15.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.toml

@@ -21,7 +21,7 @@ thiserror = "1.0"
 libc = "0.2"
 geo-types = { version = "0.7.0" }
 gdal-sys = { path = "gdal-sys", version = "^0.3"}
-ndarray = {version = "0.14", optional = true }
+ndarray = {version = "0.15", optional = true }
 chrono = { version = "0.4", optional = true }
 bitflags = "1.2"