gem fixes for tests

Author: GrantBirki

spec/acceptance/Dockerfile.entitlements-github-plugin

@@ -17,7 +17,7 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
     pkg-config
 
 # Install bundler
-RUN gem install bundler
+RUN gem install bundler -v 2.3.19
 
 # Bootstrap files and caching for speed
 COPY "vendor/cache/" "/data/entitlements/vendor/cache/"

spec/acceptance/github-server/Gemfile

@@ -1,7 +1,8 @@
 # frozen_string_literal: true
+
 source "https://rubygems.org"
 
-gem "rack", "~>2.2.8"
-gem "rack-test"
-gem "sinatra", "~>3.2.0"
-gem "webrick"
+gem "rack", "= 2.2.8"
+gem "rack-test", "~> 2.1"
+gem "sinatra", "= 3.2.0"
+gem "webrick", "~> 1.8"