fix(deps): update dependency com.google.code.gson:gson to v2.9.1 (#7)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -8,7 +8,7 @@ indra = "2.1.1"
 [libraries]
 
 # File reading/writing
-gson = "com.google.code.gson:gson:2.9.0"
+gson = "com.google.code.gson:gson:2.9.1"
 
 # Build
 build-indra-common = { module = "net.kyori:indra-common", version.ref = "indra" }