Doesn't work with deps.edn/clj toolchain?

Having trouble getting it to work with the official clj/clojure CLI.

```
% clj -Sdeps '{:deps {com.google/clojure-turtle {:mvn/version "0.3.0"}}}' 20-04-10 - 16:43:22
Downloading: com/google/clojure-turtle/0.3.0/clojure-turtle-0.3.0.pom from clojars
Downloading: quil/quil/2.2.6/quil-2.2.6.pom from clojars
Downloading: quil/processing-core/2.2.1/processing-core-2.2.1.pom from clojars
Downloading: quil/processing-dxf/2.2.1/processing-dxf-2.2.1.pom from clojars
Downloading: quil/processing-pdf/2.2.1/processing-pdf-2.2.1.pom from clojars
Downloading: quil/jogl-all-fat/2.1.5/jogl-all-fat-2.1.5.pom from clojars
Downloading: quil/processing-js/1.4.8.2/processing-js-1.4.8.2.pom from clojars
Downloading: quil/gluegen-rt-fat/2.1.5/gluegen-rt-fat-2.1.5.pom from clojars
Downloading: quil/processing-dxf/2.2.1/processing-dxf-2.2.1.jar from clojars
Downloading: quil/gluegen-rt-fat/2.1.5/gluegen-rt-fat-2.1.5.jar from clojars
Downloading: quil/processing-js/1.4.8.2/processing-js-1.4.8.2.jar from clojars
Downloading: quil/jogl-all-fat/2.1.5/jogl-all-fat-2.1.5.jar from clojars
Downloading: com/google/clojure-turtle/0.3.0/clojure-turtle-0.3.0.jar from clojars
Downloading: quil/processing-pdf/2.2.1/processing-pdf-2.2.1.jar from clojars
Downloading: quil/processing-core/2.2.1/processing-core-2.2.1.jar from clojars
Downloading: quil/quil/2.2.6/quil-2.2.6.jar from clojars
Error building classpath. Could not find artifact bouncycastle:bctsp-jdk14:jar:138 in central (https://repo1.maven.org/maven2/)
```

Start by reproducing the reported clj command with the deps.edn-style -Sdeps input and inspect how the dependency metadata resolves bouncycastle:bctsp-jdk14:jar:138. Done means the official clj/Clojure CLI can build the classpath and load clojure-turtle without the missing-artifact error.

Written by the indexing model from the issue text.