deps: update dependency org.slf4j:slf4j-api to v2

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.slf4j:slf4j-api (source)	1.7.36 -> 2.0.7

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[gcf-merge-on-green]

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[lqiu96]

Seeing this error:

[INFO] Running com.google.cloud.logging.logback.LoggingAppenderTest
Error:  Tests run: 17, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.749 s <<< FAILURE! - in com.google.cloud.logging.logback.LoggingAppenderTest
Error:  com.google.cloud.logging.logback.LoggingAppenderTest.testMdcValuesAreConvertedToLabelsWithPassingNullValues  Time elapsed: 0.092 s  <<< FAILURE!
expected: value1
but was : null
	at com.google.cloud.logging.logback.LoggingAppenderTest.testMdcValuesAreConvertedToLabelsWithPassingNullValues(LoggingAppenderTest.java:309)

@losalex -- Would you know if this due to some behavior change in v2 of slf4j?

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[forking-renovate]

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