fix(deps): Update grpc-java monorepo to v1.68.2 (#303)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [io.grpc:grpc-inprocess](https://togithub.com/grpc/grpc-java) | dependencies | patch | `1.68.1` -> `1.68.2` |
| [io.grpc:grpc-testing](https://togithub.com/grpc/grpc-java) | dependencies | patch | `1.68.1` -> `1.68.2` |
| [io.grpc:grpc-services](https://togithub.com/grpc/grpc-java) | dependencies | patch | `1.68.1` -> `1.68.2` |
| [io.grpc:grpc-stub](https://togithub.com/grpc/grpc-java) | dependencies | patch | `1.68.1` -> `1.68.2` |
| [io.grpc:grpc-protobuf](https://togithub.com/grpc/grpc-java) | dependencies | patch | `1.68.1` -> `1.68.2` |

---

### Release Notes

<details>
<summary>grpc/grpc-java (io.grpc:grpc-inprocess)</summary>

### [`v1.68.2`](https://togithub.com/grpc/grpc-java/releases/tag/v1.68.2)

##### Bug Fixes

-   api: When forwarding from Listener onAddresses to Listener2 continue to use onResult ([https://github.com/grpc/grpc-java/pull/11688](https://togithub.com/grpc/grpc-java/pull/11688)). This fixes a 1.68.1 "IllegalStateException: Not called from the SynchronizationContext" regression ([#&#8203;11662](https://togithub.com/grpc/grpc-java/issues/11662)) that could be seen in certain custom NameResolvers
-   okhttp: If the frame handler thread is null do not schedule it on the executor ([https://github.com/grpc/grpc-java/pull/11716](https://togithub.com/grpc/grpc-java/pull/11716)). This fixes a 1.68.1 NullPointerException regression when a custom transportExecutor was provided to the channel and it did not have enough threads to run new tasks

##### Improvements

-   examples: Use xds-enabled server and xds credentials in example-gcp-csm-observability ([https://github.com/grpc/grpc-java/pull/11707](https://togithub.com/grpc/grpc-java/pull/11707))

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "before 4am on the first day of the month" (UTC), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about these updates again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://togithub.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy40NDAuNyIsInVwZGF0ZWRJblZlciI6IjM3LjQ0MC43IiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJhdXRvbWVyZ2UiXX0=-->

lib/build.gradle

@@ -34,9 +34,9 @@ dependencies {
     implementation 'com.google.guava:guava:33.3.1-jre'
     implementation 'info.picocli:picocli:4.7.6'
     implementation 'com.google.guava:guava:33.3.1-jre'
-    implementation 'io.grpc:grpc-protobuf:1.68.1'
-    implementation 'io.grpc:grpc-stub:1.68.1'
-    implementation 'io.grpc:grpc-services:1.68.1'
+    implementation 'io.grpc:grpc-protobuf:1.68.2'
+    implementation 'io.grpc:grpc-stub:1.68.2'
+    implementation 'io.grpc:grpc-services:1.68.2'
     implementation 'io.cloudquery:plugin-pb-java:0.0.28'
     implementation 'org.apache.arrow:arrow-memory-core:18.1.0'
     implementation 'org.apache.arrow:arrow-vector:18.1.0'
@@ -48,8 +48,8 @@ dependencies {
     implementation 'org.apache.logging.log4j:log4j-api:2.24.2'
     implementation 'org.apache.logging.log4j:log4j-core:2.24.2'
 
-    testImplementation 'io.grpc:grpc-testing:1.68.1'
-    testImplementation 'io.grpc:grpc-inprocess:1.68.1'
+    testImplementation 'io.grpc:grpc-testing:1.68.2'
+    testImplementation 'io.grpc:grpc-inprocess:1.68.2'
     testImplementation platform('org.junit:junit-bom:5.11.3')
     testImplementation 'org.junit.jupiter:junit-jupiter:5.11.3'
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.11.3'