[bazel] Remove duplicate gson maven library (#8381)

Squashes the following warning:

```
DEBUG: /home/buildbuddy/workspace/output-base/external/rules_jvm_external/private/rules/coursier.bzl:775:18: 
Found duplicate artifact versions
    com.google.code.gson:gson has multiple versions 2.13.1, 2.10.1
Please remove duplicate artifacts from the artifact list so you do not get unexpected artifact versions
```

WORKSPACE

@@ -215,12 +215,6 @@ maven_artifacts = [
         "1.10.1",
         testonly = True,
     ),
-    maven.artifact(
-        "com.google.code.gson",
-        "gson",
-        "2.10.1",
-        testonly = False,
-    ),
     maven.artifact(
         "org.hamcrest",
         "hamcrest-all",

maven_install.json

@@ -1,10 +1,7 @@
 {
   "__AUTOGENERATED_FILE_DO_NOT_MODIFY_THIS_FILE_MANUALLY": "THERE_IS_NO_DATA_ONLY_ZUUL",
-  "__INPUT_ARTIFACTS_HASH": 1644460665,
+  "__INPUT_ARTIFACTS_HASH": -630321238,
   "__RESOLVED_ARTIFACTS_HASH": 1793205215,
-  "conflict_resolution": {
-    "com.google.code.gson:gson:2.10.1": "com.google.code.gson:gson:2.13.1"
-  },
   "artifacts": {
     "com.fasterxml.jackson.core:jackson-annotations": {
       "shasums": {