chore(deps-dev): Update sass requirement from ^1.76.0 to ^1.77.6 in /example

[dependabot]

Updates the requirements on sass to permit the latest version.

Changelog

Sourced from sass's changelog.

1.77.6

• Fix a few cases where comments and occasionally even whitespace wasn't allowed between the end of Sass statements and the following semicolon.

1.77.5

• Fully trim redundant selectors generated by @extend.

1.77.4

Embedded Sass

• Support passing Version input for fatalDeprecations as string over embedded protocol.

• Fix a bug in the JS Embedded Host where Version could be incorrectly accepted as input for silenceDeprecations and futureDeprecations in pure JS.

1.77.3

Dart API

• Deprecation.duplicateVariableFlags has been deprecated and replaced with Deprecation.duplicateVarFlags to make it consistent with the duplicate-var-flags name used on the command line and in the JS API.

1.77.2

• Don't emit deprecation warnings for functions and mixins beginning with __.

• Allow user-defined functions whose names begin with _ and otherwise look like vendor-prefixed functions with special CSS syntax.

Command-Line Interface

• Properly handle the --silence-deprecation flag.

• Handle the --fatal-deprecation and --future-deprecation flags for --interactive mode.

1.77.1

• Fix a crash that could come up with importers in certain contexts.

1.77.0

• Don't throw errors for at-rules in keyframe blocks.

1.76.0

... (truncated)

Commits

• 7aae1e6 Fix a bug where comments were incorrectly forbidden in some cases (#2264)
• cf6f9d0 Build AOT releases with native arm64 runners (#2262)
• a1b372e Enable AOT build for linux-riscv64 (#2260)
• ecff05d Remove the heuristic where long selector lists wouldn't be trimmed (#2255)
• 5ddd7fc Enable AOT build for linux-riscv64-musl (#2258)
• 53b9ead Regenerate protobuf as part of default task (#2257)
• 21eeb4d Parse Deprecation.forVersion on compiler side (#2248)
• 1073c7b Generate deprecations list from the language repo (#2253)
• fc24fec Use pubspec_parse dependency equality (#2254)
• 5121eb1 Don't treat underscores as hyphens for the purpose of error checking (#2247)
• Additional commits viewable in compare view

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