fix(rust): upgrade version

package.json

@@ -12,9 +12,9 @@
     "setup": "npm run build && npm-run-all --max-parallel 2 --parallel setup:*",
     "setup:ruby": "docker run -i -v $(pwd):/app -w /app centurylink/ruby-base:2.2 bundler",
     "setup:clojure": "docker run -i -v $(pwd):/app -w /app clojure:lein-2.8.1 lein install",
-    "setup:rust": "docker run -i -v $(pwd)/platform/rust:/source -w /source -e CARGO_HOME=/source/cargo rust:1.38.0-slim-stretch cargo build",
+    "setup:rust": "docker run -i -v $(pwd)/platform/rust:/source -w /source -e CARGO_HOME=/source/cargo rust:1.74.0-slim-buster cargo build",
     "full-build": "npm run build && npm run compile",
-    "test": "npm run build && npm-run-all --max-parallel 2 --parallel test:*",
+    "test": "npm run build && npm-run-all --max-parallel 1 --parallel test:*",
     "test:clojure": "echo 'skipping clojure test because it cant handle code too large' || docker run -i -v $(pwd):/app -w /app clojure:lein-2.8.1 lein exec test/platform.clojure.test.clj",
     "test:elixir": "docker run -i -v $(pwd):/app -w /app elixir:1.6-slim elixir test/platform.elixir.test.exs",
     "test:go": "docker run -i -v $(pwd):/app -w /app golang:1.13-alpine3.10 go test ./...",
@@ -23,7 +23,7 @@
     "test:python": "docker run -i -v $(pwd):/app -w /app python:2.7-alpine3.7 python test/*.test.py",
     "test:python3": "docker run -i -v $(pwd):/app -w /app python:3.6-alpine3.7 python test/*.test.py",
     "test:ruby": "docker run -i -v $(pwd):/app -w /app centurylink/ruby-base:2.2 ruby test/platform.ruby.test.rb",
-    "test:rust": "docker run -i -v $(pwd)/platform/rust:/source -w /source -e CARGO_HOME=/source/cargo rust:1.38.0-slim-stretch cargo test",
+    "test:rust": "docker run -i -v $(pwd)/platform/rust:/source -w /source -e CARGO_HOME=/source/cargo rust:1.74.0-slim-buster cargo test",
     "watch": "mocha -r should -R spec -u tdd -w",
     "compile": "projectz compile",
     "updtr": "updtr",