Ensure project uses Crystal 1.12

.github/workflows/qa.yml

@@ -10,7 +10,7 @@ jobs:
   qa:
     runs-on: ubuntu-latest
     container:
-      image: crystallang/crystal:1.11.1
+      image: crystallang/crystal:1.12.0
     steps:
       - uses: actions/checkout@v1
       - name: Install required packages

.github/workflows/specs.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
     container:
-      image: crystallang/crystal:1.11.1
+      image: crystallang/crystal:1.12.0
     steps:
     - uses: actions/checkout@v2
     - name: Install required packages

README.md

@@ -12,7 +12,7 @@ For more information on how to this works with other frontends/backends, head ov
 
 ## System requirements
 
-* [Crystal](https://crystal-lang.org/) 1.11+
+* [Crystal](https://crystal-lang.org/) 1.12+
 * [Node.js](https://nodejs.org/en/) - 18.x
 
 ## Installation

shard.lock

@@ -2,7 +2,7 @@ version: 2.0
 shards:
   ameba:
     git: https://github.com/crystal-ameba/ameba.git
-    version: 1.6.1+git.commit.734bb2a7f1e70f0a718bc4415888aca8d9e7177a
+    version: 1.6.1+git.commit.107c6e0ea635b827ea7ee5d7bd748fc6d8ee947c
 
   cmark:
     git: https://github.com/amauryt/cr-cmark-gfm.git
@@ -18,7 +18,7 @@ shards:
 
   marten:
     git: https://github.com/martenframework/marten.git
-    version: 0.4.0
+    version: 0.4.4
 
   marten_auth:
     git: https://github.com/martenframework/marten-auth.git