Bump PNPM to 9.15.5

[rmunn]

PNPM v9.15.5 brings in several bugfixes, at least one of which (running preprepare scripts from packages on pnpm install, and "preprepare" is not a typo) we'll probably want to have when we upgrade our SvelteKit dependency.

Fixes #1430.
Also fixes #1429.
Also fixes #1446.

[github-actions]

UI unit Tests

12 tests  ±0   12 ✅ ±0   0s ⏱️ ±0s
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Results for commit 00fea22. ± Comparison against base commit 3cc97f1.

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[github-actions]

C# Unit Tests

104 tests  ±0   104 ✅ ±0   5s ⏱️ ±0s
 16 suites ±0     0 💤 ±0 
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Results for commit 00fea22. ± Comparison against base commit 3cc97f1.

♻️ This comment has been updated with latest results.

[rmunn]

PNPM 9.15.5 was just released yesterday, and I'm seeing errors from Node Corepack when I try to run corepack enable with PNPM 9.15.5 listed in package.json. I'll convert this PR to draft and try again later, when hopefully they'll have gotten it straightened out.

[hahn-kev]

It looks like the dockerfile is still referencing the old version, funny I made this change yesterday. In both the dev and prod docker files they're running RUN corepack enable && corepack prepare [email protected] --activate so you'll need to update the pnpm version or figure out how to not hardcode it.

[rmunn]

It looks like the dockerfile is still referencing the old version, funny I made this change yesterday. In both the dev and prod docker files they're running RUN corepack enable && corepack prepare [email protected] --activate so you'll need to update the pnpm version or figure out how to not hardcode it.

PNPM versions from 9.8 onwards will self-update when they encounter a packageManager field in package.json that's higher than the current version, so we don't actually need to update the Dockerfile anymore. When we bump to PNPM 10 we may want to run corepack prepare pnpm@10 --activate (haven't tested that yet, it's possible that PNPM 9 will self-update to 10 if specified in packageManager). But all we need to do is update the version in package.json and it will automatically run that version of PNPM without changing the Dockerfile, which means fewer container layer rebuilds. It's great!