Bump Tantivy

Follow these steps to bump tantivy to its latest version:

Step 1: Check that we are on the main branch

Run: git branch --show-current

If the current branch is not main, abort and ask the user to switch to the main branch first.

Step 2: Ensure main is up to date

Run: git pull origin main

This ensures we're working from the latest code.

Step 3: Get the latest tantivy SHA

Run: gh api repos/quickwit-oss/tantivy/commits/main --jq '.sha'