fix: update source files with PHP-CS-Fixer

.php-cs-fixer.cache

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src/Context.php

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 <?php
+
 /**
  * Copyright 2019 Google LLC.
  *

src/Emitter.php

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 <?php
+
 /**
  * Copyright 2019 Google LLC.
  *

src/FunctionValidationTrait.php

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 <?php
+
 /**
  * Copyright 2023 Google LLC.
  *

src/FunctionWrapper.php

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 <?php
+
 /**
  * Copyright 2019 Google LLC.
  *

src/HttpFunctionWrapper.php

@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Copyright 2019 Google LLC.
  *

src/LegacyEventMapper.php

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 <?php
+
 /**
  * Copyright 2020 Google LLC.
  *

src/ProjectContext.php

@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Copyright 2021 Google LLC.
  *