Fix memory leak introduced in 4.7.0 (#6743)

## What's the problem this PR addresses?

It seems we forgot to call `discardAndClose` in
#6723.

Ref: #6723 (comment)

## How did you fix it?

Calls the function.

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Author: arcanis

.yarn/versions/cf0befe3.yml

@@ -0,0 +1,34 @@
+releases:
+  "@yarnpkg/cli": patch
+  "@yarnpkg/core": patch
+
+declined:
+  - "@yarnpkg/plugin-compat"
+  - "@yarnpkg/plugin-constraints"
+  - "@yarnpkg/plugin-dlx"
+  - "@yarnpkg/plugin-essentials"
+  - "@yarnpkg/plugin-exec"
+  - "@yarnpkg/plugin-file"
+  - "@yarnpkg/plugin-git"
+  - "@yarnpkg/plugin-github"
+  - "@yarnpkg/plugin-http"
+  - "@yarnpkg/plugin-init"
+  - "@yarnpkg/plugin-interactive-tools"
+  - "@yarnpkg/plugin-link"
+  - "@yarnpkg/plugin-nm"
+  - "@yarnpkg/plugin-npm"
+  - "@yarnpkg/plugin-npm-cli"
+  - "@yarnpkg/plugin-pack"
+  - "@yarnpkg/plugin-patch"
+  - "@yarnpkg/plugin-pnp"
+  - "@yarnpkg/plugin-pnpm"
+  - "@yarnpkg/plugin-stage"
+  - "@yarnpkg/plugin-typescript"
+  - "@yarnpkg/plugin-version"
+  - "@yarnpkg/plugin-workspace-tools"
+  - "@yarnpkg/builder"
+  - "@yarnpkg/doctor"
+  - "@yarnpkg/extensions"
+  - "@yarnpkg/nm"
+  - "@yarnpkg/pnpify"
+  - "@yarnpkg/sdks"

packages/yarnpkg-core/sources/Cache.ts

@@ -73,7 +73,9 @@ export class Cache {
     checksum: string | null,
   ]>> = new Map();
 
-  private refCountedZipFsCache = new RefCountedCache<string, ZipFS>(zipFs => zipFs.discardAndClose);
+  private refCountedZipFsCache = new RefCountedCache<string, ZipFS>(zipFs => {
+    zipFs.discardAndClose();
+  });
 
   /**
    * To ensure different instances of `Cache` doesn't end up copying to the same