gitlab-ruby: bump bundler version

Bump Bundler version to latest as of 2020-06-02

gitlab-ruby/Dockerfile

@@ -4,7 +4,7 @@ ARG BUILD_DIR=/tmp/build
 ARG RUBY_MAJOR_VERSION=2.7
 ARG RUBY_MINOR_VERSION=2.7.2
 ARG RUBYGEMS_VERSION=3.1.4
-ARG BUNDLER_VERSION=2.1.4
+ARG BUNDLER_VERSION=2.2.19
 ARG JEMALLOC_VERSION=5.2.1
 ARG EXIFTOOL_VERSION=11.70
 

gitlab-ruby/Dockerfile.build.ubi8

@@ -5,7 +5,7 @@ FROM ${BUILD_IMAGE}
 ARG RUBY_MAJOR_VERSION=2.7
 ARG RUBY_MINOR_VERSION=2.7.2
 ARG RUBYGEMS_VERSION=3.1.4
-ARG BUNDLER_VERSION=2.1.4
+ARG BUNDLER_VERSION=2.2.19
 ARG RBREADLINE_VERSION=0.5.5
 ARG JEMALLOC_VERSION=5.2.1
 ARG EXIFTOOL_VERSION=11.70