chore(deps): update dependency com.google.cloud:google-cloud-functions to v1.0.3 (#100)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-functions](https://togithub.com/googleapis/java-functions) | patch | `1.0.2` -> `1.0.3` |

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### Release Notes

<details>
<summary>googleapis/java-functions</summary>

### [`v1.0.3`](https://togithub.com/googleapis/java-functions/blob/master/CHANGELOG.md#&#8203;103-httpswwwgithubcomgoogleapisjava-functionscomparev102v103-2020-12-02)

[Compare Source](https://togithub.com/googleapis/java-functions/compare/v1.0.2...v1.0.3)

</details>

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samples/install-without-bom/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-functions</artifactId>
-      <version>1.0.2</version>
+      <version>1.0.3</version>
     </dependency>
     <!-- [END functions_install_without_bom] -->
 

samples/snapshot/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-functions</artifactId>
-      <version>1.0.2</version>
+      <version>1.0.3</version>
     </dependency>
   <!-- {x-version-update-end} -->
 

samples/snippets/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-functions</artifactId>
-      <version>1.0.2</version>
+      <version>1.0.3</version>
     </dependency>
 
     <dependency>