Add workaround for Ruby 3.1 after RubyGems 3.7.0 release

Author: deivid-rodriguez

dist/index.js

@@ -39,8 +39,10 @@ async function rubygemsLatest(gem, platform, engine, rubyVersion) {
  const floatVersion = common.floatVersion(rubyVersion)
  if (common.isHeadVersion(rubyVersion)) {
  console.log('Ruby master builds use included RubyGems')
- } else if (floatVersion >= 3.1) {
+ } else if (floatVersion >= 3.2) {
  await exec.exec(gem, ['update', '--system'])
+ } else if (floatVersion >= 3.1) {
+ await exec.exec(gem, ['update', '--system', '3.6.9'])
  } else if (floatVersion >= 3.0) {
  await exec.exec(gem, ['update', '--system', '3.5.23'])
  } else if (floatVersion >= 2.6) {