Update to [Truth 1.4.0](https://github.com/google/truth/releases/tag/v1.4.0).

This makes available the rest of the Truth APIs that were recently added in Google's monorepo.

It may be worth also updating to the _following_ version of Truth after it's released, but the purpose of that release will mostly be to deprecate `Truth8`. So, if you just avoid using `Truth8` now (starting by approving any migration CLs that I send your way), then there will be little need for that upgrade. Or, more to the point: I don't expect to keep sending you weekly upgrade CLs after this one :)

PiperOrigin-RevId: 604700830

Author: cpovirk

WORKSPACE

@@ -69,9 +69,9 @@ maven_install(
         "com.google.protobuf:protobuf-java-util:3.24.4",
         "com.google.re2j:re2j:1.7",
         "com.google.testparameterinjector:test-parameter-injector:1.14",
-        "com.google.truth.extensions:truth-java8-extension:1.3.0",
-        "com.google.truth.extensions:truth-proto-extension:1.3.0",
-        "com.google.truth:truth:1.3.0",
+        "com.google.truth.extensions:truth-java8-extension:1.4.0",
+        "com.google.truth.extensions:truth-proto-extension:1.4.0",
+        "com.google.truth:truth:1.4.0",
         "org.antlr:antlr4-runtime:" + ANTLR4_VERSION,
         "org.jspecify:jspecify:0.2.0",
         "org.threeten:threeten-extra:1.7.2",