Bump Node.js from v16 to v20

[pquentin]

CI is currently broken because clients-flight-recorder has switched from the EOL v16 to v20. Let's do the same thing here.

[Anaethelion]

LGTM

[github-actions]

The backport to 7.17 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-7.17 7.17
# Navigate to the new working tree
cd .worktrees/backport-7.17
# Create a new branch
git switch --create backport-2492-to-7.17
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 fe1ef9e8cb558e3b0d0e3cb3dd2297847e80b966
# Push it to GitHub
git push --set-upstream origin backport-2492-to-7.17
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-7.17

Then, create a pull request where the base branch is 7.17 and the compare/head branch is backport-2492-to-7.17.

[github-actions]

The backport to 8.12 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-8.12 8.12
# Navigate to the new working tree
cd .worktrees/backport-8.12
# Create a new branch
git switch --create backport-2492-to-8.12
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 fe1ef9e8cb558e3b0d0e3cb3dd2297847e80b966
# Push it to GitHub
git push --set-upstream origin backport-2492-to-8.12
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-8.12

Then, create a pull request where the base branch is 8.12 and the compare/head branch is backport-2492-to-8.12.