Php82 fixes

[mschering]

Released under the GNU Affero General Public License (AGPL), version 3

Some PHP 8.2 compatibility fixes.

[matidau]

@mschering Thanks for the PR, sorry it's taken me so long to get to it.

z-push-top in develop isn't causing me any PHP 8.2 errors, for the most part I think your changes might be implementation dependent with the backend your using. Could be wrong let me know your thoughts.

For the serialization, this is an issue, thank you for raising it. Your commit is causing an error with the state files. Example from the log:

01/08/2024 15:56:52 [1229260] [WARN] [[email protected]] /usr/local/lib/z-push/lib/utils/utils.php:1466 Erroneous data format for unserializing 'StateObject' (2)
01/08/2024 15:56:52 [1229260] [WARN] [[email protected]] /usr/local/lib/z-push/lib/utils/utils.php:1466 unserialize(): Error at offset 22 of 2493 bytes (8)
01/08/2024 15:56:52 [1229260] [WARN] [[email protected]] FileStateMachine->GetState(): Failed on unserializing filename '/var/lib/z-push/9/1/androidc1307007219-devicedata' - attempt: 1
01/08/2024 15:56:52 [1229260] [FATAL] [[email protected]] FileStateMachine->GetState():Unable to unserialize filename '/var/lib/z-push/9/1/androidc1307007219-devicedata' after 1 attempts

Cheers,
Mat