Bump gradle-bintray-plugin from 1.7.3 to 1.8.4 (#6735)

Bumps gradle-bintray-plugin from 1.7.3 to 1.8.4.

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

build.gradle

@@ -13,7 +13,7 @@ buildscript {
   ext.jacocoVersion = "0.8.4"
   ext.animalSnifferVersion = "1.5.0"
   ext.licenseVersion = "0.15.0"
-  ext.bintrayVersion = "1.7.3"
+  ext.bintrayVersion = "1.8.4"
   ext.jfrogExtractorVersion = "4.11.0"
   ext.bndVersion = "4.3.1"
   ext.checkstyleVersion = "6.19"