Fix error with google/cloud-logging and psr

[pylipp]

• in Upgrade composer packages #739 we updated a couple of PHP packages
• now we're seeing this error in our deployed app (on Google App Engine)

36 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Declaration of Google\Cloud\Logging\PsrLogger::emergency(Stringable|string $message, array $context = []): void must be compatible with Psr\Log\LoggerInterface::emergency($message, array $context = []) in /workspace/vendor/google/cloud-logging/src/PsrLogger.php on line 172" while reading response header from upstream, client: 169.254.1.1, server: , request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/tmp/google-config/app.sock:", host: "staging.boxtribute.org"

• the app currently errors with HTTP status 500
• please resolve this