Replace usage of ruby 2.7 everywhere

.github/workflows/gempush.yml

@@ -8,14 +8,14 @@ on:
 jobs:
   build:
     name: Build + Publish
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v4
-      - name: Set up Ruby 2.7
+      - name: Set up Ruby 3.2
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '2.7'
+          ruby-version: '3.2'
       - name: Check release validity
         run: sh .github/scripts/check-release.sh
       - name: Publish to RubyGems

.github/workflows/pre-release-tests.yml

@@ -12,7 +12,7 @@ on:
 
 jobs:
   integration-tests:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:

README.md

@@ -76,7 +76,7 @@ This package guarantees compatibility with [version v1.x of Meilisearch](https:/
 
 ## 🔧 Installation <!-- omit in toc -->
 
-This package requires Ruby version 2.7.0 or later and Rails 6.1 or later. It may work in older versions but it is not officially supported.
+This package requires Ruby version 3.0 or later and Rails 6.1 or later. It may work in older versions but it is not officially supported.
 
 With `gem` in command line:
 ```bash

playground/.ruby-version

@@ -1 +1 @@
-2.7.2
+3.0