Update wikimedia/less.php requirement from ^3.1 to ^5.1

[dependabot]

Updates the requirements on wikimedia/less.php to permit the latest version.

Changelog

Sourced from wikimedia/less.php's changelog.

v5.1.0

Added:

• Add support for property acessors (Piotr Miazga) T368408
• Increase parsing flexibility around at-rule blocks and custom properties (Piotr Miazga) T368408
• Add support for Namespaces and Accessors (Piotr Miazga) T368409

Fixed:

• Fix parse error when opacity is set to zero in alpha() function (Hannah Okwelum) T371606

v5.0.0

Added:

• Add support for Lessjs 3.5.0 calc() exception (Piotr Miazga) T367186
• Add support for CSS Grid syntax (Dringsim) T288498
• Add support for \9 escapes in CSS keyword (Dringsim) T288498
• Add Less_Parser "math" option, renamed from strictMath (Hannah Okwelum) T366445

Changed:

• Change Less_Parser "math" default from "always" to "parens-division" (Hannah Okwelum) T366445
• Change Less_Version::less_version to "3.13.3". This end compatibility support of Less.js 2.5.3. Less.php 5.0 and later will target Less.js 3.13.1 behaviour instead. (Piotr Miazga)

Removed:

• Remove import_callback Less_Parser option (Hannah Okwelum)
• Remove backtick evaluation inside quoted strings (Bartosz Dziewoński)
• Remove Less_Parser::AllParsedFiles() (Hannah Okwelum)
• Remove Less_Parser->SetInput() public method, now private (Hannah Okwelum)
• Remove Less_Parser->CacheFile() public method, now private (Hannah Okwelum)
• Remove Less_Parser->UnsetInput() public method, now private (Hannah Okwelum)
• Remove Less_Parser->save() public method, now private (Hannah Okwelum)

v4.4.1

Fixed:

• Update Less_Version::version and bump Less_Version::cache_version (Timo Tijhof)

v4.4.0

Added:

• Add image-size() function, disable base64 for SVG data-uri() (Hannah Okwelum) T353147
• Improve support for preserving !important via variables (Piotr Miazga) T362341
• Add support for include path inside data-uri() (Hannah Okwelum) T364871

Changed, to match Less.js 2.5.3:

• Fix multiplication of mixed units to preserve the first unit (Piotr Miazga) T362341

Fixed:

• Fix checking of guard conditions in nested mixins (Hannah Okwelum) T352867
• Less_Functions: Avoid clobbering clamp() with internal helper (Timo Tijhof) T363728

... (truncated)

Commits

• b66f357 Tag v5.1.0
• dd843a2 Merge "Fix parse error when opacity is set to zero to alpha() function"
• 0d80730 Fix parse error when opacity is set to zero to alpha() function
• f8b680c docs: Reference version is now Less.js 3.13, no longer 2.5
• c28be8d Merge "Minor 3.13 sync in Less_Tree for Anonymous, NamespaceValue, JavaScript"
• 96ca779 Build: Remove unused .easymin configuration file
• a7fef13 Minor 3.13 sync in Less_Tree for Anonymous, NamespaceValue, JavaScript
• bd77cff test: getVariables() should handle properties and namespace values
• f912315 Introduce Namespace values
• d58c345 Increase parsing flexibility around at-rule blocks and custom properties
• Additional commits viewable in compare view

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