Bump truth-java8-extension from 1.0.1 to 1.1.3 in /migrator

Bumps truth-java8-extension from 1.0.1 to 1.1.3.

---
updated-dependencies:
- dependency-name: com.google.truth.extensions:truth-java8-extension
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

migrator/pom.xml

@@ -71,7 +71,7 @@
         <dependency>
             <groupId>com.google.truth.extensions</groupId>
             <artifactId>truth-java8-extension</artifactId>
-            <version>1.0.1</version>
+            <version>1.1.3</version>
             <scope>test</scope>
         </dependency>
         <dependency>