Fix SQLite defaults for boolean type

[batopa]

After cakephp/cakephp#18973 the default values of boolean type for SQLite database are always integers 1 or 0.

It impacts the value of $default attribute passed to SqliteAdapter::parseDefaultValue() that is an integer.
As consequence of that a TypeError is thrown calling preg_match_all($pattern, $default, $matches) because the second attribute must be a string.

This PR fixes the error, returning early the $default value if isn't a string.

In addition tests have been fixed to respect the integer default values.

[batopa]

🤔 the prefer-lowest tests fail because the minimum version of cakephp is 5.2.5 where there aren't the last changes about default values.

I don't know if it is possible to upgrade the minimum version of cakephp to 5.2.9 or if it is a problem.

[markstory]

I don't know if it is possible to upgrade the minimum version of cakephp to 5.2.9 or if it is a problem.

We can bump the min-version up.

[batopa]

If I'm not wrong it's missing the dependency to cakephp/database too.

[dereuromark]

Nice work!