fix: preserve empty lines between scss nested maps

[jneander]

Description

Empty lines between SCSS maps nested within other maps are not being preserved by prettier. This resolves that.

No issue was found for this particular bug. As a reference, it relates to prettier#12536, which mentioned the issue via code comment and in the pull request.

Checklist

• I’ve added tests to confirm my change works.
• (If changing the API or CLI) I’ve documented the changes I’ve made (in the docs/ directory).
• (If the change is user-facing) I’ve added my changes to changelog_unreleased/*/XXXX.md file following changelog_unreleased/TEMPLATE.md.
• I’ve read the contributing guidelines.

✨Try the playground for this PR✨

[github-actions]

Size Change: +169 B (0%)

Total Size: 11.6 MB

Filename	Size	Change
./dist/esm/standalone.mjs	442 kB	+34 B (0%)
./dist/index.js	1.42 MB	+101 B (0%)
./dist/standalone.js	442 kB	+34 B (0%)

ℹ️ View Unchanged

Filename	Size
./dist/bin-prettier.js	1.98 kB
./dist/cli.js	501 kB
./dist/doc.js	69.6 kB
./dist/esm	4.1 kB
./dist/esm/parser-angular.mjs	58.5 kB
./dist/esm/parser-babel.mjs	320 kB
./dist/esm/parser-espree.mjs	154 kB
./dist/esm/parser-flow.mjs	1.05 MB
./dist/esm/parser-glimmer.mjs	192 kB
./dist/esm/parser-graphql.mjs	42.8 kB
./dist/esm/parser-html.mjs	160 kB
./dist/esm/parser-markdown.mjs	168 kB
./dist/esm/parser-meriyah.mjs	162 kB
./dist/esm/parser-postcss.mjs	157 kB
./dist/esm/parser-typescript.mjs	1.47 MB
./dist/esm/parser-yaml.mjs	128 kB
./dist/LICENSE	294 kB
./dist/package.json	616 B
./dist/parser-angular.js	58.9 kB
./dist/parser-babel.js	321 kB
./dist/parser-espree.js	154 kB
./dist/parser-flow.js	1.05 MB
./dist/parser-glimmer.js	192 kB
./dist/parser-graphql.js	43.2 kB
./dist/parser-html.js	160 kB
./dist/parser-markdown.js	169 kB
./dist/parser-meriyah.js	162 kB
./dist/parser-postcss.js	157 kB
./dist/parser-typescript.js	1.47 MB
./dist/parser-yaml.js	129 kB
./dist/README.md	3.96 kB
./dist/third-party.js	303 kB

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