chore: upgrade starkbank/ecdsa version

[tiwarishubham635]

Fixes

Upgrading starkbank/ecdsa to latest version to resolve this issue:
One of our customers reached out to support regarding documentation on Github for sendgrid php As per the customer, starkbank/ecdsa (v0.*) used in the php SDK (https://github.com/sendgrid/sendgrid-php) generates a deprecated warning in php8.2. Please provide the version of starkbank/ecdsa. WARNING: Creation of dynamic property EllipticCurve\PublicKey::$pem is deprecated in /.../vendor/starkbank/ecdsa/src/publickey.php on line 9 WARNING: Creation of dynamic property EllipticCurve\PublicKey::$openSslPublicKey is deprecated in /.../vendor/starkbank/ecdsa/src/publickey.php on line 10 WARNING: Creation of dynamic property EllipticCurve\Signature::$der is deprecated in /.../vendor/starkbank/ecdsa/src/signature.php on line 9

Checklist

• I acknowledge that all my contributions will be made under the project's license
• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the Contribution Guidelines and my PR follows them
• I have titled the PR appropriately
• I have updated my branch with the main branch
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation about the functionality in the appropriate .md file
• I have added inline documentation to the code I modified

If you have questions, please file a support ticket.