Rename uppercase JPG file to lowercase jpg

To not introduce new file type and since it is not related to a test.
Lowercase JPG file type more common and recommended to use.

Author: petk

ext/exif/tests/bug77184/DJI_0245_tiny.JPG renamed to ext/exif/tests/bug77184/DJI_0245_tiny.jpg

@@ -7,7 +7,7 @@ output_handler=
 zlib.output_compression=0
 --FILE--
 <?php
-$infile = __DIR__.'/DJI_0245_tiny.JPG';
+$infile = __DIR__.'/DJI_0245_tiny.jpg';
 $tags = exif_read_data($infile);
 echo $tags['GPSLatitude'][2], PHP_EOL;
 echo $tags['GPSLongitude'][2], PHP_EOL;