Upgrade testcontainers to 1.15.3

Upgrade docker-java to 3.2.8, accordingly; required by this upgrade.

This change is also to keep aligning with core's testcontainers version.

Change-Id: I43e3d18e9d9bcaba164d348cf257138d27d89129

external_plugin_deps.bzl

diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index bbde3ce..33c4e4e 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -121,21 +121,21 @@
         sha1 = "0e0845217c4907822403912ad6828d8e0b256208",
     )
 
-    DOCKER_JAVA_VERS = "3.2.7"
+    DOCKER_JAVA_VERS = "3.2.8"
 
     maven_jar(
         name = "docker-java-api",
         artifact = "com.github.docker-java:docker-java-api:" + DOCKER_JAVA_VERS,
-        sha1 = "81408fc988c229ea11354fee9902c47842343f04",
+        sha1 = "4ac22a72d546a9f3523cd4b5fabffa77c4a6ec7c",
     )
 
     maven_jar(
         name = "docker-java-transport",
         artifact = "com.github.docker-java:docker-java-transport:" + DOCKER_JAVA_VERS,
-        sha1 = "315903a129f530422747efc163dd255f0fa2555e",
+        sha1 = "c3b5598c67d0a5e2e780bf48f520da26b9915eab",
     )
 
-    # https://github.com/docker-java/docker-java/blob/3.2.7/pom.xml#L61
+    # https://github.com/docker-java/docker-java/blob/3.2.8/pom.xml#L61
     # <=> DOCKER_JAVA_VERS
     maven_jar(
         name = "jackson-annotations",
@@ -143,28 +143,28 @@
         sha1 = "0f63b3b1da563767d04d2e4d3fc1ae0cdeffebe7",
     )
 
-    TESTCONTAINERS_VERS = "1.15.1"
+    TESTCONTAINERS_VERS = "1.15.3"
 
     maven_jar(
         name = "testcontainers",
         artifact = "org.testcontainers:testcontainers:" + TESTCONTAINERS_VERS,
-        sha1 = "91e6dfab8f141f77c6a0dd147a94bd186993a22c",
+        sha1 = "95c6cfde71c2209f0c29cb14e432471e0b111880",
     )
 
     maven_jar(
         name = "testcontainers-database-commons",
         artifact = "org.testcontainers:database-commons:" + TESTCONTAINERS_VERS,
-        sha1 = "8df5154407220beeb3233b5ec3aa89b1febd388b",
+        sha1 = "e63193bdf7e1cba4c743b858068289f2836eca16",
     )
 
     maven_jar(
         name = "testcontainers-jdbc",
         artifact = "org.testcontainers:jdbc:" + TESTCONTAINERS_VERS,
-        sha1 = "39b11e5451182a1bc6a2bb50deca0986df2519c6",
+        sha1 = "8b43efd5646199955d4ad6adedc038f750feb145",
     )
 
     maven_jar(
         name = "testcontainers-postgres",
         artifact = "org.testcontainers:postgresql:" + TESTCONTAINERS_VERS,
-        sha1 = "dc8f763e6307bee635adfc6c31aebd7092215d6d",
+        sha1 = "47d181885af4e3d3e2f775bd904e73f2210c9be0",
     )