bump ruby version to 2.7.3

This has some security fixes, though none that should impact us. Mostly
I want to make sure the bumping process works with CI (it would be nice
if we could read the .ruby-version or Gemfile from the CI code; I think
it's possible but non-trivial).

1 files changed, 1 insertions, 1 deletions

diff --git a/Gemfile b/Gemfile
index 0e3dcb1a..ebd49cbe 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 source "https://rubygems.org"
-ruby "2.7.2"
+ruby "2.7.3"
 
 gem "rails", "~> 6.0"