Align version number of PHPUnit and give a helping install hint

Signed-off-by: Joas Schilling <coding@schilljs.com>

autotest.sh

@@ -61,7 +61,8 @@ else
 fi
 
 if ! [ -x "$PHPUNIT" ]; then
-	echo "phpunit executable not found, please install phpunit version >= 9.0" >&2
+	echo "phpunit executable not found, please install phpunit version >= 9.0 manually or via:" >&2
+	echo "  cd build/integration && composer install" >&2
 	exit 3
 fi
 
@@ -76,8 +77,8 @@ PHPUNIT_VERSION=$($PHPUNIT --version | cut -d" " -f2)
 PHPUNIT_MAJOR_VERSION=$(echo "$PHPUNIT_VERSION" | cut -d"." -f1)
 PHPUNIT_MINOR_VERSION=$(echo "$PHPUNIT_VERSION" | cut -d"." -f2)
 
-if ! [ "$PHPUNIT_MAJOR_VERSION" -gt 6 -o \( "$PHPUNIT_MAJOR_VERSION" -eq 6 -a "$PHPUNIT_MINOR_VERSION" -ge 5 \) ]; then
-	echo "phpunit version >= 6.5 required. Version found: $PHPUNIT_VERSION" >&2
+if ! [ "$PHPUNIT_MAJOR_VERSION" -gt 6 -o \( "$PHPUNIT_MAJOR_VERSION" -eq 9 -a "$PHPUNIT_MINOR_VERSION" -ge 0 \) ]; then
+	echo "phpunit version >= 9.0 required. Version found: $PHPUNIT_VERSION" >&2
 	exit 4
 fi