[Security] Bump haml from 3.1.7 to 5.1.2

[dependabot-preview]

Bumps haml from 3.1.7 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)

5.0.4

Released on October 13, 2017
(diff).

• Fix haml -c --stdin regression in 5.0.2. #958 (thanks Timo Göllner)
• Ruby 2.5 support (it wasn't working due to Ripper API change). (Akira Matsuda)

5.0.3

Released on September 7, 2017
(diff).

• Use String#dump instead of String#inspect to generate string literal. (Takashi Kokubun)
• Fix Erubi superclass mismatch error. #952 (thanks Robin Daugherty)

5.0.2

Released on August 1, 2017
(diff).

• Let haml -c fail if generated Ruby code is syntax error. #880 (Takashi Kokubun)
• Fix NoMethodError bug caused with Sprockets 3 and :sass filter. #930 (thanks Gonzalez Maximiliano)

... (truncated)

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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[dependabot-preview]

We've just been alerted that this update fixes a security vulnerability:

Sourced from The GitHub Security Advisory Database.

Moderate severity vulnerability that affects haml
In haml versions prior to version 5.0.0.beta.2, when using user input to perform tasks on the server, characters like < > " ' must be escaped properly. In this case, the ' character was missed. An attacker can manipulate the input to introduce additional attributes, potentially executing code.

Affected versions: ["< 5.0.0"]