Update @cloudflare/containers to 0.3.0 (#571)

Require the latest Containers release so sandbox apps pick up the
current platform updates.

Author: whoiskatrin

.changeset/containers-030.md

@@ -0,0 +1,5 @@
+---
+'@cloudflare/sandbox': patch
+---
+
+Require `@cloudflare/containers` 0.3.0 so sandbox apps pick up the latest Containers platform updates.

package-lock.json

@@ -8,7 +8,7 @@
   "description": "A sandboxed environment for running commands",
   "type": "module",
   "dependencies": {
-    "@cloudflare/containers": "^0.2.3",
+    "@cloudflare/containers": "^0.3.0",
     "aws4fetch": "^1.0.20"
   },
   "devDependencies": {

packages/sandbox/package.json

@@ -647,7 +647,6 @@ export class Sandbox<Env = unknown> extends Container<Env> implements ISandbox {
         this.renewActivityTimeout();
       }
 
-      // @ts-expect-error - interceptHttps is supplied by the container primitive subclass shape
       if (this.interceptHttps) {
         this.envVars = { ...this.envVars, SANDBOX_INTERCEPT_HTTPS: '1' };
       }

packages/sandbox/src/sandbox.ts

@@ -1073,7 +1073,6 @@ describe('Sandbox - Automatic Session Management', () => {
   describe('constructor - interceptHttps env injection', () => {
     it('injects SANDBOX_INTERCEPT_HTTPS into envVars when interceptHttps is true', async () => {
       class SandboxWithHttps extends Sandbox<Record<string, unknown>> {
-        // @ts-expect-error - interceptHttps will be declared by the upstream primitives base type
         override interceptHttps = true;
       }
 
@@ -1112,7 +1111,6 @@ describe('Sandbox - Automatic Session Management', () => {
 
     it('preserves existing envVars entries when injecting', async () => {
       class SandboxWithHttps extends Sandbox<Record<string, unknown>> {
-        // @ts-expect-error - interceptHttps will be declared by the upstream primitives base type
         override interceptHttps = true;
         override envVars: Record<string, string> = { MY_KEY: 'my-value' };
       }