replace useless specific output file to temp file at test.

[sasezaki]

Currently, tests/OutputFormatter/data/generated-baseline.yml is committed that result of basicDataProvider data set #0.

After developer running test, generated-baseline.yml file will be chagned with other data set.

eg.

$ git diff
diff --git a/tests/OutputFormatter/data/generated-baseline.yml b/tests/OutputFormatter/data/generated-baseline.yml
index 1c28cb2..c3af77a 100644
--- a/tests/OutputFormatter/data/generated-baseline.yml
+++ b/tests/OutputFormatter/data/generated-baseline.yml
@@ -1,3 +1,3 @@
 skip_violations:
-  ClassA:
-    ClassB: ClassB
+  OriginalA:
+    - OriginalB

Because, PHPUnit would randomly test for dataProvider data set.

$ ./tools/phpunit.phar --testdox --filter "testBasic" tests/OutputFormatter/BaselineOutputFormatterTest.php
PHPUnit 8.5.13 by Sebastian Bergmann and contributors.

Random seed:   1611926497

Baseline Output Formatter (Tests\SensioLabs\Deptrac\OutputFormatter\BaselineOutputFormatter)
 ✔ Basic with data set 0
 ✔ Basic with data set 2
 ✔ Basic with data set 4
 ✔ Basic with data set 3
 ✔ Basic with data set 1

Time: 2.5 seconds, Memory: 14.00 MB

OK (5 tests, 5 assertions)

This generated-baseline.yml changes will be troubled when using git commit -a -m or other git commands under developing.
so, I propose this fix.

[smoench]

Thank you @sasezaki!