build(deps): bump haml from 5.0.4 to 5.1.2

[dependabot-preview]

Bumps haml from 5.0.4 to 5.1.2.

Changelog

Sourced from haml's changelog.

5.1.2

Released on August 6, 2019
(diff).

• Fix crash in some environments such as New Relic by unfreezing string literals for ParseNode#inspect. #1016 (thanks Jalyna)

5.1.1

Released on May 25, 2019
(diff).

• Fix NameError bug that happens on ruby 2.6.1-2.6.3 + haml 5.1.0 + rails < 5.1 + erubi. (Akira Matsuda)

5.1.0

Released on May 16, 2019
(diff).

• Rails 6 support #1008 (thanks Seb Jacobs)
• Add escape_filter_interpolations option for backwards compatibility with haml 4 defaults #984 (thanks Will Jordan)
• Fix error on empty :javascript and :css filter blocks #986 (thanks Will Jordan)
• Respect changes in Haml::Options.defaults in Haml::TempleEngine options (Takashi Kokubun)
• Un-freeze TempleEngine precompiled string literals #983 (thanks Will Jordan)
• Various performance/memory improvements #965, #966, #963 (thanks Dillon Welch)
• Enable frozen_string_literal magic comment for all .rb files #967 (thanks Dillon Welch)

Commits

• 9be4e1f Version 5.1.2
• 645fcfc rails 4.2 requires bundler < 2 without bundler >= 2 being installed
• 4dbb180 Merge pull request #1016 from jalyna/fix-frozen-string-literals-on-inspect
• bc88181 Unfreeze string literals for ParseNode#inspect
• a054e2a Stop polluting toplevel unnecessarily
• 2705bbc ⛳
• c7da7a1 ruby < 1.9.3 is no longer supported
• d134875 Freeze some constants
• f7c5baa if + else = elsif
• d6c50ec This has been just an accessor since 1b784bcc50f5f437fd85b9e1a5fe147665d5a5ca
• Additional commits viewable in compare view

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[coveralls]

Pull Request Test Coverage Report for Build 560

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 86.667%

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Totals
Change from base Build 412:	0.0%
Covered Lines:	13
Relevant Lines:	15

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💛 - Coveralls

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[dependabot-preview]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.