Use short array syntax (new coding standard)

Drupal Coding standard issues.

FILE: /var/www/html/Contribution/searchjson/search_json.module
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FOUND 12 ERRORS AFFECTING 12 LINES
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  1 | ERROR | [x] End of line character is invalid; expected "\n" but
    |       |     found "\r\n"
 12 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found
    |       |     0
 13 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found
    |       |     0
 14 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found
    |       |     0
 15 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found
    |       |     0
 16 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found
    |       |     0
 23 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found
    |       |     0
 24 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found
    |       |     0
 25 | ERROR | [x] Short array syntax must be used to define arrays
 26 | ERROR | [x] Short array syntax must be used to define arrays
 27 | ERROR | [x] Short array syntax must be used to define arrays
 28 | ERROR | [x] Short array syntax must be used to define arrays
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PHPCBF CAN FIX THE 12 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /var/www/html/Contribution/searchjson/search_json.routing.yml
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FOUND 1 ERROR AFFECTING 1 LINE
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 16 | ERROR | [x] Expected 1 newline at end of file; 0 found
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...www/html/Contribution/searchjson/src/Form/SearchjsonSettings.php
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FOUND 4 ERRORS AFFECTING 4 LINES
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 25 | ERROR | [x] Short array syntax must be used to define arrays
 28 | ERROR | [x] Short array syntax must be used to define arrays
 33 | ERROR | [x] Short array syntax must be used to define arrays
 39 | ERROR | [x] Short array syntax must be used to define arrays
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PHPCBF CAN FIX THE 4 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...html/Contribution/searchjson/src/Controller/SearchController.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 16 | ERROR | [x] Short array syntax must be used to define arrays
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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