Bump eslint version to v9

[tyler-dane]

The current version of eslint is not supported. Let's get on the latest version.

https://eslint.org/version-support/

The warning:

warning [email protected]: This version is no longer supported. Please see https://eslint.org/version-support for other options.

How to trigger the warning: run node build:

# running build
yarn cli build node                                                                 

# getting info
yarn run v1.22.22
$ export NODE_ENV=development && yarn ts-node  --pretty --transpile-only -r tsconfig-paths/register packages/scripts/src/cli build node
$ /Users/ty/src/switchback/compass/node_modules/.bin/ts-node --pretty --transpile-only -r tsconfig-paths/register packages/scripts/src/cli build node
? Select environment to use: (Use arrow keys)
❯ staging
? Select environment to use: production
? What package(s) do you want to build? nodePckgs
Removing old node build ...
Removed old node build
Env file does not exist: /Users/ty/src/switchback/compass/packages/backend/.prod.env
? Continue anyway? Yes

# running build
Continuing without env file ...
Copying package configs to build ...
Copied package configs to build
Compiling node packages ...
$ /Users/ty/src/switchback/compass/node_modules/.bin/tsc --project tsconfig.build.json
Compiled node pckgs
Installing dependencies...
info No lockfile found.
[1/4] Resolving packages...
warning @compass/backend > googleapis > google-auth-library > gtoken > [email protected]: Package is no longer maintained

# here's the warning 👇
warning [email protected]: This version is no longer supported. Please see https://eslint.org/version-support for other options.
warning eslint > @humanwhocodes/[email protected]: Use @eslint/config-array instead

Acceptance Criteria

• uses v9
• no console warnings when building project
• no other errors created