Update rebar3 binary, works from Erlang/OTP 22 to 25

The old version was:
  rebar 3.15.2
and it couldn't work with Erlang/OTP 25

This new version is
  rebar 3.18.0
compiled from tag 3.18.0 from
  https://github.com/erlang/rebar3
using erlang:22-slim docker image

To compile ejabberd using rebar3 and ancient Erlang 19.3-21.3,
you need a rebar3 binary compiled with an old Erlang.
If your operating system doesn't provide one, you can download
the old one included in ejabberd 21.12, available at:
  https://github.com/processone/ejabberd/raw/21.12/rebar3

1 files changed, 0 insertions, 0 deletions

diff --git a/rebar3 b/rebar3
index c052f9ac..bf1935ce 100755
--- a/rebar3
+++ b/rebar3