fix: close the UdpWriter

[sokil]

Proposed Changes

If UPD socket was previously closed by \InfluxDB2\UdpWriter::close and new write occured, error will be obtained socket_sendto(): Argument #1 ($socket) has already been closed

    $writeApi = $client->createUdpWriter();
    $writeApi->write("weather,location=Tokio temperature=$temp $seconds");
    $writeApi->close();
    $writeApi->write("weather,location=Tokio temperature=$temp $seconds"); // uses link to closed socket

This is because method close does not unset socket property:

    public function close()
    {
        if (isset($this->socket)) {
            socket_close($this->socket);
        }
    }

And getSocket does not create new connection because old still in socket property:

    protected function getSocket()
    {
        if (empty($this->socket)) {
            $this->socket = socket_create($this->getConfiguredInetVersion(), SOCK_DGRAM, SOL_UDP);
        }
        return $this->socket;
    }

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• make test completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.07 ⚠️

Comparison is base (5ff8234) 74.93% compared to head (123f1dd) 74.86%.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #144      +/-   ##
============================================
- Coverage     74.93%   74.86%   -0.07%     
  Complexity      424      424              
============================================
  Files            25       25              
  Lines          1093     1094       +1     
============================================
  Hits            819      819              
- Misses          274      275       +1     

Impacted Files	Coverage Δ
src/InfluxDB2/UdpWriter.php	39.47% <0.00%> (-1.07%)	⬇️

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[bednar]

@sokil thanks for your PR 👍

Can you please satisfy our checklist? After that we will be able to merge this PR:

[sokil]

done

[bednar]

@sokil thanks again for PR 👍

[sokil]

Thank you for quick feedback!!