fix: remove reachability from plugins

[magdziarek]

• Follows CONTRIBUTING rules

What does this PR do?

Bumps versions of snyk-gradle-plugin and snyk-mvn-plugin

Snyk CLI has removed --reachable. See #3588
so we are removing reachability and call-graph code in plugins. Relevant PRs:
snyk/snyk-mvn-plugin#138
snyk/snyk-gradle-plugin#236

[github-actions]

	Warnings
⚠️	Since the CLI is unifying on a standard and improved tooling, we're starting to migrate old-style imports and exports to ES6 ones. A file you've modified is using either module.exports or require(). If you can, please update them to ES6 import syntax and export syntax. Files found: src/cli/args.ts webpack.common.ts
⚠️	You've modified files in src/ directory, but haven't updated anything in test folder. Is there something that could be tested?

Generated by 🚫 dangerJS against cdebec7

[e102]

Looks good from an @snyk/apollo perspective assuming these plugins aren't used elsewhere