chore: Add version update script compatible with ci-tools.

Author: iphydf

Diff for: tools/update-versions.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+set -eux -o pipefail
+
+VERSION=$1
+
+GIT_ROOT=$(git rev-parse --show-toplevel)
+cd "$GIT_ROOT"
+
+# Strip suffixes (e.g. "-rc.1") from the version for the toxcore version sync.
+VERSION="${VERSION%-*}"
+
+IFS="." read -ra version_parts <<<"$VERSION"
+
+other/version-sync "$GIT_ROOT" "${version_parts[0]}" "${version_parts[1]}" "${version_parts[2]}"