Public-sans: Update Node LTS

[mahoneycm]

Summary

Set node 18 as the default. Updated .nvmrc file from 16→18, which is the current LTS version.

Breaking change

This is not a breaking change.

Related issue

Closes #281 .

Related pull requests

Related to: uswds/uswds-site#2304 uswds/uswds#5560

Preview link

Public-sans →

Problem statement

Support for node 16 is going to stop on CloudGov pages.

Solution

1. Update .nvmrc to 18.
2. Run npm audit fix.
3. Update ruby gems.

Testing and review

1. Run npm install and confirm no errors.
2. Run npm run build and confirm no errors.
3. Run npm run start and confirm no errors.
4. Run npm run serve and confirm site builds as expected.

Checklist

• [ ] No errors when installing, building, starting, or serving the site
• [ ] No regressions on public-sans demo site

Gem updates

Indented gems are sub dependencies

Gem name	Previous version	New version
addressable	2.8.0	2.8.5
public_suffix	≥ 2.0.2, < 5.0	≥ 2.0.2, < 6.0
concurrent-ruby	1.1.10	1.2.2
ffi	1.15.5	1.16.3
google-protobuf	-	3.24.4
i18n	1.10.0	1.14.1
jekyll	4.2.2	4.3.2
- jekyll-sass-converter	~> 2.0	≥ 2.0, <4.0
- kramdown	~>2.3	~> 2.3, ≥ 2.3.1
- mercenary	~> 0.4.0	≥ 3.0, < 0.5
- rouge	~> 3.0	≥ 3.2, < 5.0
- terminal-table	~> 2.0	≥ 1.8, <4.0
- webrick	-	~> 1.7
jekyll-sass-converter	2.2.0	3.0.0
- sassc	> 2.0.1, < 0.33	-
- sass-embedded	-	~> 1.54
liquid	4.0.3	4.0.4
listen	3.7.1	3.8.0
public_suffix	4.0.7	5.0.3
rack	2.2.6.2	2.2.8
rb-fsevent	0.11.1	0.11.2
rexml	3.2.5	3.2.6
rouge	3.28.0	4.1.3
sassc	2.4.0	-
- ffi	~> 1.69	-
sass-embedded	-	1.69.4
- google-protobuf	-	~> 3.23
- rake	-	≥ 13.0.0
terminal-table	2.0.0	3.0.2
- unicode-display_width	~> 1.1, ≥ 1.1.1	≥ 1.1.1, < 3
thin	1.8.1	1.8.2
unicode-display_width	1.8.0	2.5.0
webrick	1.7.0	1.8.1