Remove Lumen 11 support as it is abandoned, it seems

[Lumen GitHub repository](https://github.com/laravel/lumen) shows as of
4th June 2024 as "archived". A message shows in the README.md:

> Note: In the years since releasing Lumen, PHP has made a variety of wonderful
> performance improvements. For this reason, along with the availability of
> Laravel Octane, we no longer recommend that you begin new projects with
> Lumen. Instead, we recommend always beginning new projects with Laravel.

.github/workflows/continuous-integration.yml

@@ -694,7 +694,6 @@ jobs:
           - "8.*"
           - "9.*"
           - "10.*"
-          - "11.*"
         php-version:
           - "7.2"
           - "7.3"
@@ -734,12 +733,6 @@ jobs:
           - {lumen-version: "10.*", php-version: "7.3"} # Lumen 10 requires 8.1+
           - {lumen-version: "10.*", php-version: "7.4"} # Lumen 10 requires 8.1+
           - {lumen-version: "10.*", php-version: "8.0"} # Lumen 10 requires 8.1+
-          # Lumen 11 supports PHP 8.2 - 8.3
-          - {lumen-version: "11.*", php-version: "7.2"} # Lumen 11 requires 8.2+
-          - {lumen-version: "11.*", php-version: "7.3"} # Lumen 11 requires 8.2+
-          - {lumen-version: "11.*", php-version: "7.4"} # Lumen 11 requires 8.2+
-          - {lumen-version: "11.*", php-version: "8.0"} # Lumen 11 requires 8.2+
-          - {lumen-version: "11.*", php-version: "8.1"} # Lumen 11 requires 8.2+
     steps:
       - uses: actions/checkout@v3
       - name: "Install PHP"
@@ -782,7 +775,6 @@ jobs:
           - "8.*"
           - "9.*"
           - "10.*"
-          - "11.*"
         php-version:
           - "7.2"
           - "7.3"
@@ -822,12 +814,6 @@ jobs:
           - {lumen-version: "10.*", php-version: "7.3"} # Lumen 10 requires 8.1+
           - {lumen-version: "10.*", php-version: "7.4"} # Lumen 10 requires 8.1+
           - {lumen-version: "10.*", php-version: "8.0"} # Lumen 10 requires 8.1+
-          # Lumen 11 supports PHP 8.2 - 8.3
-          - {lumen-version: "11.*", php-version: "7.2"} # Lumen 11 requires 8.2+
-          - {lumen-version: "11.*", php-version: "7.3"} # Lumen 11 requires 8.2+
-          - {lumen-version: "11.*", php-version: "7.4"} # Lumen 11 requires 8.2+
-          - {lumen-version: "11.*", php-version: "8.0"} # Lumen 11 requires 8.2+
-          - {lumen-version: "11.*", php-version: "8.1"} # Lumen 11 requires 8.2+
     env:
       SCOUT_APM_KEY: ${{ secrets.SCOUT_APM_KEY }}
     steps:

composer.json

@@ -29,7 +29,7 @@
         "doctrine/coding-standard": "^12.0",
         "guzzlehttp/guzzle": "^7.4",
         "laravel/framework": "^5.5.0|^6.0|^7.0|^8.0|^9.0|^10.0|^11.0",
-        "laravel/lumen-framework": "^5.5.0|^6.0|^7.0|^8.0|^9.0|^10.0|^11.0",
+        "laravel/lumen-framework": "^5.5.0|^6.0|^7.0|^8.0|^9.0|^10.0",
         "monolog/monolog": "^1.27|^2.5|^3.0",
         "nesbot/carbon": "^2.62.1 || ^3.5",
         "nyholm/psr7": "^1.5",