.devcontainer: Update to newer bazelisk.

Other syntax changes.

.devcontainer/Dockerfile

@@ -15,7 +15,7 @@ RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
     && apt-get autoremove -y && apt-get clean -y && rm -rf /var/lib/apt/lists/* /tmp/library-scripts
 
 # Install Bazel
-ARG BAZELISK_VERSION=v1.10.1
+ARG BAZELISK_VERSION=v1.18.0
 ARG BAZELISK_DOWNLOAD_SHA=dev-mode
 RUN curl -fSsL -o /usr/local/bin/bazelisk https://github.com/bazelbuild/bazelisk/releases/download/${BAZELISK_VERSION}/bazelisk-linux-amd64 \
     && ([ "${BAZELISK_DOWNLOAD_SHA}" = "dev-mode" ] || echo "${BAZELISK_DOWNLOAD_SHA} */usr/local/bin/bazelisk" | sha256sum --check - ) \

.devcontainer/devcontainer.json

@@ -5,17 +5,21 @@
 	"build": {
 		"dockerfile": "Dockerfile",
 		"args": {
-			"BAZELISK_VERSION": "v1.10.1",
+			"BAZELISK_VERSION": "v1.18.0",
 			"BAZELISK_DOWNLOAD_SHA": "4cb534c52cdd47a6223d4596d530e7c9c785438ab3b0a49ff347e991c210b2cd"
 		}
 	},
-	// Set *default* container specific settings.json values on container create.
-	"settings": {},
-	// Add the IDs of extensions you want installed when the container is created.
-	"extensions": [
-		"devondcarew.bazel-code",
-		"BazelBuild.vscode-bazel"
-	],
+	"customizations": {
+		"vscode": {
+			// Set *default* container specific settings.json values on container create.
+			"settings": {},
+			// Add the IDs of extensions you want installed when the container is created.
+			"extensions": [
+				"devondcarew.bazel-code",
+				"BazelBuild.vscode-bazel"
+			]
+		}
+	},
 	// Use 'forwardPorts' to make a list of ports inside the container available locally.
 	// "forwardPorts": [],
 	// Use 'postCreateCommand' to run commands after the container is created.