git-multipush: fix devel build, audit fixes

[apjanke]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same formula update/change?
• Does your submission pass brew audit --strict --online <formula> (where <formula> is the name of the formula you're submitting)?
• Have you built your formula locally prior to submission with brew install <formula>?

Description

Upstream's devel tarball releases don't build; probably due to an issue with the GitHub release packaging method, and it being tested only from cloned repos. This just sticks in a missing release tag.

Upstream issue: gavinbeatty/git-multipush#1

Plus audit fixes.

Closes Homebrew/legacy-homebrew#50530

[apjanke]

Build failed on Mavericks only, failing to check out the commit. Huh?

 GitHub pull request #29 of commit 4fbde56dcb00166465fde5d2bd09263c386c505f, no merge conflicts.
[EnvInject] - Loading node environment variables.
Building remotely on mavericks in workspace /Users/brew/Jenkins/versions/version/mavericks
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://github.com/Homebrew/homebrew-core/ # timeout=10
Fetching upstream changes from https://github.com/Homebrew/homebrew-core/
 > git --version # timeout=10
 > git -c core.askpass=true fetch --tags --progress https://github.com/Homebrew/homebrew-core/ +refs/pull/*:refs/remotes/origin/pr/*
Checking out Revision 462b0b73ee988969df9d7cf3df926e19c00e1472 (refs/remotes/origin/pr/29/merge)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 462b0b73ee988969df9d7cf3df926e19c00e1472
FATAL: Could not checkout 462b0b73ee988969df9d7cf3df926e19c00e1472
hudson.plugins.git.GitException: Could not checkout 462b0b73ee988969df9d7cf3df926e19c00e1472
    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$9.execute(CliGitAPIImpl.java:1992)
    at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:152)
    at 
...

I'm just retrying the build. Maybe it's intermittent flakeage.

[apjanke]

A simple rerun on Jenkins fixed it. Merged.