build: updated gson to 2.9.0

[MMaiero]

Signed-off-by: MMaiero [email protected]

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echo "maven/mavencentral/com.google.code.gson/gson/2.9.0" | java -jar /Users/matteo.maiero/Downloads/org.eclipse.dash.licenses-0.0.1-20220729.055040-500.jar -      
[main] INFO Querying Eclipse Foundation for license data for 1 items.
[main] INFO Found 1 items.
[main] INFO Vetted license information was found for all content. No further investigation is required.