Tnolet/maintenance updates (#959)

* chore: bump to node 18 [sc-00]

* chore: fixes via npm audit fix [sc-00]

* chore: updates vulnerable oclif packages and out of date ts-jest [sc-00]

* fix: make locations for CheckGroup optional fixes #939 [sc-00]

Author: tnolet

.nvmrc

@@ -1 +1 @@
-v16.17.0
+v18.20.4

CONTRIBUTING.md

@@ -34,7 +34,7 @@ npm run watch --workspace packages/cli
 
 ### Running E2E test locally
 
-To run the E2E tests pointing to your local backed use the `npm run test:e2e:local --workspace packages/cli`
+To run the E2E tests pointing to your local backend use the `npm run test:e2e:local --workspace packages/cli`
 
 Remember that the `--workspace packages/cli` flag isn't necessary when running commands from the `packages/cli` directory.