Fix broken Gatling URL

[dongxuwang]

Replace the broken url

[ihostage]

Hi, @dongxuwang! Good catch, thanks! 👍 Can you fix a few other URLs are related with Gatling in this PR?

[ihostage]

@Mergifyio backport 2.9.x

[mergify[bot]]

backport 2.9.x

✅ Backports have been created

• #556 [2.9.x] Fix broken Gatling URL (backport #532) by @dongxuwang has been created for branch 2.9.x

[ihostage]

@Mergifyio backport main

[mergify[bot]]

backport main

✅ Backports have been created

• #557 [main] Fix broken Gatling URL (backport #532) by @dongxuwang has been created for branch main