Add test for wildcard_dependencies

tests/ui-cargo/wildcard_dependencies/fail/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "wildcard_dependencies"
+version = "0.1.0"
+
+[dependencies]
+regex = "*"

tests/ui-cargo/wildcard_dependencies/fail/src/main.rs

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+#![warn(clippy::wildcard_dependencies)]
+
+fn main() {}

tests/ui-cargo/wildcard_dependencies/fail/src/main.stderr

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+error: wildcard dependency for `regex`
+   |
+   = note: `-D clippy::wildcard-dependencies` implied by `-D warnings`
+
+error: aborting due to previous error
+

tests/ui-cargo/wildcard_dependencies/pass/Cargo.toml

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+[package]
+name = "wildcard_dependencies"
+version = "0.1.0"
+
+[dependencies]
+regex = "1"

tests/ui-cargo/wildcard_dependencies/pass/src/main.rs

@@ -0,0 +1,3 @@
+#![warn(clippy::wildcard_dependencies)]
+
+fn main() {}