fix(plugin-essentials): fix hash validation pattern of explain peer-requirements (#6881)

## What's the problem this PR addresses?

This fix of issue described here
#6880

## How did you fix it?

Fix validation of hash at `explain peer-requirements` command

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---------

Co-authored-by: Maël Nison <[email protected]>

Author: pudovmaxim

.yarn/versions/d432d26e.yml

@@ -0,0 +1,23 @@
+releases:
+  "@yarnpkg/cli": patch
+  "@yarnpkg/plugin-essentials": patch
+
+declined:
+  - "@yarnpkg/plugin-compat"
+  - "@yarnpkg/plugin-constraints"
+  - "@yarnpkg/plugin-dlx"
+  - "@yarnpkg/plugin-init"
+  - "@yarnpkg/plugin-interactive-tools"
+  - "@yarnpkg/plugin-nm"
+  - "@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/core"
+  - "@yarnpkg/doctor"

packages/plugin-essentials/sources/commands/explain/peerRequirements.ts

@@ -20,7 +20,7 @@ export default class ExplainPeerRequirementsCommand extends BaseCommand {
 
       When used without arguments, this command lists all peer requirements and the corresponding hash that can be used to get detailed information about a given requirement.
 
-      **Note:** A hash is a six-letter p-prefixed code that can be obtained from peer dependency warnings or from the list of all peer requirements (\`yarn explain peer-requirements\`).
+      **Note:** A hash is a seven-letter code consisting of the letter 'p' followed by six characters that can be obtained from peer dependency warnings or from the list of all peer requirements(\`yarn explain peer-requirements\`).
     `,
     examples: [[
       `Explain the corresponding peer requirement for a hash`,
@@ -34,7 +34,7 @@ export default class ExplainPeerRequirementsCommand extends BaseCommand {
   hash = Option.String({
     required: false,
     validator: t.cascade(t.isString(), [
-      t.matchesRegExp(/^p[0-9a-f]{5}$/),
+      t.matchesRegExp(/^p[0-9a-f]{6}$/),
     ]),
   });