chore: update dependency com.google.code.gson:gson to v2.13.1 (#85)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.code.gson:gson](https://redirect.github.com/google/gson) |
`2.12.1` -> `2.13.1` |
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|
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|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.google.code.gson:gson/2.12.1/2.13.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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gradle/libs.versions.toml

@@ -17,7 +17,7 @@ testcontainers = "1.21.0"
 lombok = "1.18.38"
 
 # runtime dependencies
-gson = "2.12.1"
+gson = "2.13.1"
 jjwt = "0.12.6"
 guava = "33.4.6-jre"
 annotations = "26.0.2"