chore(deps): upgrade node version from 18 => 20

[jamesgorrie]

What are you doing in this PR?

Upgrades Node to the latest LTS version (20). 18 is currently in maintenance.

Why are you doing this?

I was hoping to update the setup-java action - but realised as part of that release they had bumped to node 20.

This is to ensure we have parity across dev / build / prod.

How to test

• Run CDK locally
  We had to upgrade CDK, and thus @guardian/cdk to have full Node 20 support
• Run support-frontend node app locally

[github-actions]

Deploy build 8547 of support::stripe-patrons-data to CODE

All deployment options

• Deploy build 8547 of support::stripe-patrons-data to CODE
• Deploy parts of build 8547 to CODE by previewing it first
• What's on CODE right now?

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From guardian/actions-riff-raff.

[github-actions]

Size Change: 0 B

Total Size: 1.73 MB

ℹ️ View Unchanged

Filename	Size
./public/compiled-assets/javascripts/ausMomentMap.js	108 kB
./public/compiled-assets/javascripts/contributionsRedirectStyles.js	20 B
./public/compiled-assets/javascripts/digitalSubscriptionLandingPage.js	202 kB
./public/compiled-assets/javascripts/downForMaintenancePage.js	67.8 kB
./public/compiled-assets/javascripts/error404Page.js	67.8 kB
./public/compiled-assets/javascripts/error500Page.js	67.7 kB
./public/compiled-assets/javascripts/favicons.js	616 B
./public/compiled-assets/javascripts/paperSubscriptionCheckoutPage.js	166 kB
./public/compiled-assets/javascripts/paperSubscriptionLandingPage.js	84.5 kB
./public/compiled-assets/javascripts/payPalErrorPage.js	66.3 kB
./public/compiled-assets/javascripts/payPalErrorPageStyles.js	20 B
./public/compiled-assets/javascripts/promotionTerms.js	71.1 kB
./public/compiled-assets/javascripts/subscriptionsLandingPage.js	70.1 kB
./public/compiled-assets/javascripts/subscriptionsRedemptionPage.js	124 kB
./public/compiled-assets/javascripts/supporterPlusLandingPage.js	257 kB
./public/compiled-assets/javascripts/unsupportedBrowserStyles.js	20 B
./public/compiled-assets/javascripts/weeklySubscriptionCheckoutPage.js	166 kB
./public/compiled-assets/javascripts/weeklySubscriptionLandingPage.js	84.7 kB
./public/compiled-assets/webpack/385.js	81.8 kB
./public/compiled-assets/webpack/67.js	18 kB
./public/compiled-assets/webpack/735.js	2 kB
./public/compiled-assets/webpack/775.js	17.8 kB
./public/compiled-assets/webpack/991.js	2.16 kB

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[GHaberis]

Looks good 👍

[prout-bot]

Seen on PROD (merged by @jamesgorrie 12 minutes and 6 seconds ago)

• Keep an eye out for post deployment test results on teamcity

Sentry Release: support-client-side, support