Drop Ruby 3.0

Author: jeremycole

.github/workflows/rspec.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ["3.0", "3.1", "3.2", "3.3", "3.4"]
+        ruby-version: ["3.1", "3.2", "3.3", "3.4"]
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby

.github/workflows/rubocop.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ["3.0", "3.1", "3.2", "3.3", "3.4"]
+        ruby-version: ["3.1", "3.2", "3.3", "3.4"]
     steps:
       - uses: actions/checkout@v2
       - name: Set up Ruby

.github/workflows/sorbet.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ["3.0", "3.1", "3.2", "3.3", "3.4"]
+        ruby-version: ["3.1", "3.2", "3.3", "3.4"]
     steps:
       - uses: actions/checkout@v2
       - name: Set up Ruby