Update tools (and manage Composer through Phive)

.phive/phars.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phive xmlns="https://phar.io/phive">
-  <phar name="php-cs-fixer" version="^2.16" installed="2.16.4" location="./tools/php-cs-fixer" copy="true"/>
+  <phar name="php-cs-fixer" version="^2.16" installed="2.16.7" location="./tools/php-cs-fixer" copy="true"/>
   <phar name="psalm" version="^4.0" installed="4.0.1" location="./tools/psalm" copy="true"/>
   <phar name="roave/backwardcompatibilitycheck" version="^5.0.0" installed="5.0.0" location="./tools/roave-backward-compatibility-check" copy="true"/>
+  <phar name="composer" version="^2.0.3" installed="2.0.3" location="./tools/composer" copy="true"/>
 </phive>

build.xml

@@ -22,10 +22,6 @@
             <arg value="update"/>
             <arg value="--force-accept-unsigned"/>
         </exec>
-
-        <exec executable="${basedir}/tools/composer" taskname="composer">
-            <arg value="self-update"/>
-        </exec>
     </target>
 </project>