fix php8.1 deprecated message

[georgesamy]

We got the following message in our project when upgrading to php8.1, this PR will fix these deprecation warnings

PHP Deprecated:  Return type of SevenShores\Hubspot\Http\Response::offsetExists($offset) 
should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the 
#[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in 
/srv/backend/vendor/hubspot/hubspot-php/src/Http/Response.php on line 65

PHP Deprecated:  Return type of SevenShores\Hubspot\Http\Response::offsetGet($offset)
 should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the
 #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in
 /srv/backend/vendor/hubspot/hubspot-php/src/Http/Response.php on line 77

PHP Deprecated:  Return type of SevenShores\Hubspot\Http\Response::offsetSet($offset, $value)
 should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the
 #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in 
/srv/backend/vendor/hubspot/hubspot-php/src/Http/Response.php on line 90

PHP Deprecated:  Return type of SevenShores\Hubspot\Http\Response::offsetUnset($offset) 
should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the 
#[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in 
/srv/backend/vendor/hubspot/hubspot-php/src/Http/Response.php on line 100

We have version v4.0.1 installed

[jmglsn]

@ksvirkou-hubspot can you please create a new release with this fix?

[jwage]

Can we create a new release for this?

[jmglsn]

That would be cool... the warnings are annoying.