update ruby 2.7.2 -> 2.7.3

.github/workflows/tests.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 2.7.2
+        ruby-version: 2.7.3
         bundler-cache: true # runs 'bundle install' and caches installed gems automatically
     - name: Set up Node
       uses: actions/setup-node@v1

.ruby-version

@@ -1 +1 @@
-2.7.2
+2.7.3

Dockerfile

@@ -1,9 +1,11 @@
 # HEADS UP!
 # This Dockerfile is for DEVELOPMENT use only;
-# it's in no way optimized for production.
+# it's in no way optimized for production and is largely maintained by
+# the open source community for convenience. Installing the full stack
+# manually is the preferred setup for Notebook.ai instances.
 
 # The image to build from.
-FROM ruby:2.7.2
+FROM ruby:2.7.3
 
 # Properties/labels for the image.
 LABEL maintainer="Notebook.ai Contributors"