Drop Support for PHP 7.3

- Update laminas-coding-standard to ~2.4.0 (Closes #14)
- Update dot files, tool configuration and export-ignores
- Update psalm and fix issues relating to class-strings for unknown types
- Stop ignoring platform reqs on 8.1

Signed-off-by: George Steel <[email protected]>

.gitattributes

@@ -1,9 +1,8 @@
-/.coveralls.yml export-ignore
-/.docheader export-ignore
 /.gitattributes export-ignore
 /.gitignore export-ignore
-/.travis.yml export-ignore
 /docs/ export-ignore
 /phpcs.xml export-ignore
+/psalm.xml export-ignore
+/psalm-baseline.xml export-ignore
 /phpunit.xml.dist export-ignore
 /test/ export-ignore

.gitignore

@@ -1,7 +1,5 @@
 /.phpcs-cache
 /.phpunit.result.cache
 /clover.xml
-/coveralls-upload.json
 /phpunit.xml
-/psalm.xml
 /vendor/

.laminas-ci.json

@@ -1,13 +1,2 @@
 {
-    "exclude": [
-        {
-            "name": "PHPUnit on PHP 7.1 with locked dependencies"
-        },
-        {
-            "name": "PHPUnit on PHP 7.2 with locked dependencies"
-        }
-    ],
-    "ignore_php_platform_requirements": {
-        "8.1": true
-    }
 }

composer.json

@@ -23,7 +23,7 @@
     "config": {
         "sort-packages": true,
         "platform": {
-            "php": "7.3.99"
+            "php": "7.4.99"
         },
         "allow-plugins": {
             "dealerdirect/phpcodesniffer-composer-installer": true
@@ -35,7 +35,7 @@
         }
     },
     "require": {
-        "php": "^7.3 || ~8.0.0 || ~8.1.0",
+        "php": "^7.4 || ~8.0.0 || ~8.1.0",
         "laminas/laminas-escaper": "^2.5",
         "league/plates": "^3.3",
         "mezzio/mezzio-helpers": "^5.2",
@@ -44,11 +44,11 @@
         "psr/container": "^1.0 || ^2.0"
     },
     "require-dev": {
-        "laminas/laminas-coding-standard": "~2.2.0",
+        "laminas/laminas-coding-standard": "~2.4.0",
         "phpspec/prophecy-phpunit": "^2.0",
         "phpunit/phpunit": "^9.5.24",
         "psalm/plugin-phpunit": "0.17.0",
-        "vimeo/psalm": "^4.4"
+        "vimeo/psalm": "^4.27.0"
     },
     "conflict": {
         "container-interop/container-interop": "<1.2.0",