Update dependencies

Cargo.lock

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 [[package]]
 
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 [[package]]
 
 [[package]]
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 [[package]]
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 [[package]]
 
 [[package]]
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 [[package]]
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Cargo.toml

 authors = ["Johannes Hofmann <mail@b-r-u.org>"]
 
 [dependencies]
-gl = "0.7"
+gl = "0.9"
 image = "0.18"
 linked-hash-map = "0.5.0"
 osmpbf = "0.1"
 toml = "0.4"
 
 [build-dependencies]
-gl_generator = "0.7"
+gl_generator = "0.8"