[Ubuntu] upgrade php version to 8.1 (#4681)

images/linux/scripts/installers/php.sh

@@ -72,7 +72,7 @@ for version in $php_versions; do
         apt-fast install -y --no-install-recommends php$version-recode
     fi
 
-    if [[ $version != "8.0" ]]; then
+    if [[ $version != "8.0" && $version != "8.1" ]]; then
         apt-fast install -y --no-install-recommends php$version-xmlrpc php$version-json
     fi
 

images/linux/toolsets/toolset-1804.json

@@ -271,7 +271,8 @@
             "7.2",
             "7.3",
             "7.4",
-            "8.0"
+            "8.0",
+            "8.1"
         ]
     },
     "selenium": {

images/linux/toolsets/toolset-2004.json

@@ -270,7 +270,8 @@
     "php": {
         "versions": [
             "7.4",
-            "8.0"
+            "8.0",
+            "8.1"
         ]
     },
     "rubygems": [