Fix release tooling for juniper_codegen

Patch juniper_codegen dev dependency on juniper.

Author: theduke

juniper/release.toml

@@ -6,6 +6,8 @@ upload-doc = false
 pre-release-replacements = [
   # Juniper's changelog
   {file="CHANGELOG.md", search="# master", replace="# master\n\n- No changes yet\n\n# [[{{version}}] {{date}}](https://github.com/graphql-rust/juniper/releases/tag/{{crate_name}}-{{version}})"},
+  # codegen
+  {file="../juniper_codegen/Cargo.toml", search="juniper = \\{ version = \"[^\"]+\"", replace="juniper = { version = \"{{version}}\""},
   # Tests.
   {file="../integration_tests/juniper_tests/Cargo.toml", search="juniper = \\{ version = \"[^\"]+\"", replace="juniper = { version = \"{{version}}\""},
   # Hyper