Bump puma from 3.12.1 to 3.12.4 in /backend

[dependabot]

Bumps puma from 3.12.1 to 3.12.4.

Changelog

Sourced from puma's changelog.

4.3.3 and 3.12.4 / 2020-02-28

• Bugfixes
  • Fix: Fixes a problem where we weren't splitting headers correctly on newlines (#2132)
• Security
  • Fix: Prevent HTTP Response splitting via CR in early hints. CVE-2020-5249.

4.3.2 and 3.12.3 / 2020-02-27 (YANKED)

• Security
  • Fix: Prevent HTTP Response splitting via CR/LF in header values. CVE-2020-5247.

4.3.1 and 3.12.2 / 2019-12-05

• Security
  • Fix: a poorly-behaved client could use keepalive requests to monopolize Puma's reactor and create a denial of service attack. CVE-2019-16770.

4.3.0 / 2019-11-07

• Features

  • Strip whitespace at end of HTTP headers (#2010)
  • Optimize HTTP parser for JRuby (#2012)
  • Add SSL support for the control app and cli (#2046, #2052)

• Bugfixes

  • Fix Errno::EINVAL when SSL is enabled and browser rejects cert (#1564)
  • Fix pumactl defaulting puma to development if an environment was not specified (#2035)
  • Fix closing file stream when reading pid from pidfile (#2048)
  • Fix a typo in configuration option --extra_runtime_dependencies (#2050)

4.2.1 / 2019-10-07

• 3 bugfixes
  • Fix socket activation of systemd (pre-existing) unix binder files (#1842, #1988)
  • Deal with multiple calls to bind correctly (#1986, #1994, #2006)
  • Accepts symbols for verify_mode (#1222)

4.2.0 / 2019-09-23

• 6 features
  • Pumactl has a new -e environment option and reads config/puma/<environment>.rb config files (#1885)
  • Semicolons are now allowed in URL paths (MRI only), useful for Angular or Redmine (#1934)
  • Allow extra dependencies to be defined when using prune_bundler (#1105)
  • Puma now reports the correct port when binding to port 0, also reports other listeners when binding to localhost (#1786)
  • Sending SIGINFO to any Puma worker now prints currently active threads and their backtraces (#1320)
  • Puma threads all now have their name set on Ruby 2.3+ (#1968)
• 4 bugfixes
  • Fix some misbehavior with phased restart and externally SIGTERMed workers (#1908, #1952)
  • Fix socket closing on error (#1941)
  • Removed unnecessary SIGINT trap for JRuby that caused some race conditions (#1961)

... (truncated)

Commits

• f809e6b Add missing server_run
• 87fc7d7 3.12.4
• e79a5b2 HTTP Injection - fix bug + 1 more vector (#2136)
• 2ff978f 3.12.3
• 3a2b918 Test backport
• 37928cb 4.3.2 and 3.12.3 release notes
• 1b17e85 Merge pull request from GHSA-84j7-475p-hp8v
• bb29fc7 3.12.2
• 058df12 4.3.1 and 4.2.1 release notes
• 06053e6 Merge pull request from GHSA-7xx3-m584-x994
• Additional commits viewable in compare view

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