Ensure project is tested using Crystal 1.13

Author: ellmetha

.github/workflows/ci.yml

@@ -26,9 +26,9 @@ jobs:
         crystal:
           - latest
           - nightly
-          - 1.10.0
           - 1.11.2
-          - 1.12.0
+          - 1.12.2
+          - 1.13.0
     runs-on: ubuntu-latest
     container:
       image: crystallang/crystal:${{ matrix.crystal }}

.github/workflows/docs.yml

@@ -8,7 +8,7 @@ jobs:
   build-and-deploy:
     runs-on: ubuntu-latest
     container:
-      image: crystallang/crystal:1.12.0
+      image: crystallang/crystal:1.13.0
     steps:
       - name: Work around permission issue
         run: git config --global --add safe.directory /__w/i18n/i18n