Update directories requirement from >=4, <6 to >=4, <7

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

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

plotly_kaleido/Cargo.toml

@@ -31,4 +31,4 @@ plotly_kaleido = { path = ".", features = ["download"] }
 
 [build-dependencies]
 zip = "2.1"
-directories = ">=4, <6"
+directories = ">=4, <7"