minor #17348 [Yaml] Fix tests on PHP 7.0.2 (nicolas-grekas)

This PR was merged into the 2.3 branch.

Discussion
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[Yaml] Fix tests on PHP 7.0.2

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #1234
| License       | MIT
| Doc PR        | -

Related to https://bugs.php.net/66179 that has been fixed in 7.0.2

Commits
-------

902f6dd [Yaml] Fix tests on PHP 7.0.2

src/Symfony/Component/Yaml/Tests/Fixtures/YtsSpecificationExamples.yml

@@ -515,7 +515,7 @@ yaml: |
 php: |
   array(
     'canonical' => 12345,
-    'decimal' => 12345,
+    'decimal' => 12345.0,
     'octal' => 014,
     'hexadecimal' => 0xC
   )
@@ -1536,7 +1536,7 @@ yaml: |
 php: |
    array(
      'canonical' => 12345,
-     'decimal' => 12345,
+     'decimal' => 12345.0,
      'octal' => 12,
      'hexadecimal' => 12
    )

src/Symfony/Component/Yaml/Tests/Fixtures/YtsTypeTransfers.yml

@@ -182,8 +182,8 @@ php: |
     array(
       'zero' => 0,
       'simple' => 12,
-      'one-thousand' => 1000,
-      'negative one-thousand' => -1000
+      'one-thousand' => 1000.0,
+      'negative one-thousand' => -1000.0
     )
 ---
 test: Integers as Map Keys