[CI] - Explicitly set pnpm version to 9

[RomarQ]

What does it do?

Fixes issues in the CI: https://github.com/moonbeam-foundation/moonbeam/actions/runs/20300479846/job/58304577695

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch rq/fix-ci2

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[github-actions]

WASM runtime size check:

Compared to target branch

Moonbase runtime: 2124 KB (no changes) ✅

Moonbeam runtime: 2240 KB (no changes) ✅

Moonriver runtime: 2240 KB (no changes) ✅

Compared to latest release (runtime-4100)

Moonbase runtime: 2124 KB (+188 KB compared to latest release) ⚠️

Moonbeam runtime: 2240 KB (+208 KB compared to latest release) ⚠️

Moonriver runtime: 2240 KB (+208 KB compared to latest release) ⚠️

[github-actions]

Coverage Report

@@              Coverage Diff              @@
##           master   rq/fix-ci2     +/-   ##
=============================================
  Coverage   76.70%       76.70%   0.00%     
  Files         389          389             
  Lines       76595        76595             
=============================================
  Hits        58745        58745             
  Misses      17850        17850             

Files Changed	Coverage

Coverage generated Wed Dec 17 11:48:46 UTC 2025