fix: fix credentialId migration type

[asbiin]

Changed credentialId migration type to mediumText.

If you already have created the webauthn_keys you can upgrade the column with a new migration:

        Schema::table('webauthn_keys', function (Blueprint $table) {
            $table->mediumText('credentialId')->change();
        });

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:tada: This PR is included in version 3.2.1 :tada:

The release is available on:

• GitHub release
• 3.2.1

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