Fix C with Cedilla GSM code point

[Starfox64]

Description

EncodingDetector incorrectly uses the lowercase version of Latin Small Letter C with Cedilla (U+00E7) instead of Latin Capital Letter C with Cedilla (U+00C7).

See https://en.wikipedia.org/wiki/GSM_03.38#GSM_7-bit_default_alphabet_and_extension_table_of_3GPP_TS_23.038_/_GSM_03.38

Motivation and Context

Prevents sending characters that require unicode encoding to be sent as text, causing invalid characters to be displayed in an SMS.

How Has This Been Tested?

Manual call to EncodingDetector::requiresUnicodeEncoding() after correcting the list.

Example Output or Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[Starfox64]

Hello, anything blocking this PR?

[SecondeJK]

I'm working on a fairly major release, so I'm aiming to incorporate this into it. As usual with libraries like this, time is always short

[SecondeJK]

I've enabled the test runner - can you please fix the tests accordingly?

[SecondeJK]

The test suite is still failing - can you update the tests to pass and run locally before pushing? Thanks

[Starfox64]

Fixed, tests are passing locally.

[codecov-commenter]

Codecov Report

Merging #318 (f3ad749) into main (3d0c1f3) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main     #318   +/-   ##
=========================================
  Coverage     82.37%   82.37%           
  Complexity     1928     1928           
=========================================
  Files           157      157           
  Lines          4918     4918           
=========================================
  Hits           4051     4051           
  Misses          867      867           

Impacted Files	Coverage Δ
src/Message/EncodingDetector.php	100.00% <100.00%> (ø)

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[SecondeJK]

Awesome, thanks for this