dev_container: Uprev to include clang

Need clang to compile minijail policies

TEST=new container can build crosvm with minijail policies included
BUG=b:235858187

Change-Id: Id26898025ef1ff3148da2edc5af3d923a00401c2
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3792428
Commit-Queue: Zihan Chen <zihanchen@google.com>
Auto-Submit: Zihan Chen <zihanchen@google.com>
Reviewed-by: Dennis Kempin <denniskempin@google.com>
Tested-by: Zihan Chen <zihanchen@google.com>

.devcontainer/devcontainer.json

@@ -1,5 +1,5 @@
 {
-    "image": "gcr.io/crosvm-packages/crosvm_dev:r0012",
+    "image": "gcr.io/crosvm-packages/crosvm_dev:r0014",
     "extensions": [
         "rust-lang.rust-analyzer",
         "bungcip.better-toml",

tools/impl/dev_container/version

@@ -1 +1 @@
-r0013
+r0014

tools/install-deps

@@ -7,6 +7,7 @@ set -ex
 sudo apt-get update
 sudo apt-get install --yes --no-install-recommends \
     ca-certificates \
+    clang \
     cloud-image-utils \
     curl \
     dpkg-dev \