Update `import-in-the-middle` PR gates

[timfish]

For import-in-the-middle we are bumping the minimum supported Node version but the PR cannot be merged because the PR requires all the old CI jobs to pass.

Can someone update the PR gates to remove the Node version jobs that we no longer require?

• chore!: drop support for Node.js < v18 import-in-the-middle#230 (comment)

[targos]

Done