Update CI actions to latest versions and add manual dispatch

Author: JanTvrdik

.github/workflows/checks.yml

@@ -1,5 +1,6 @@
 name: Checks
 on:
+    workflow_dispatch:
     pull_request:
     push:
         branches:

.github/workflows/lint.yml

@@ -1,5 +1,6 @@
 name: phpcs.xml lint
 on:
+    workflow_dispatch:
     pull_request:
     push:
         branches:
@@ -12,7 +13,7 @@ jobs:
         steps:
             -
                 name: Checkout code
-                uses: actions/checkout@v3
+                uses: actions/checkout@v4
 
             -
                 name: Install dependencies