Use a non-beta version of Bootstrap

Upgrade it to 4.1.3, including dependencies.
4 jobs for master in 24 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #6263
test

00:00:24

 
  Build Src
skipped #6264
build:src
 
  Build Pkg
skipped #6265
build:pkg
 
  Upload
skipped #6266
upload:pkg
 
Name Stage Failure
failed
test Test
Cloning into '/builds/id/go-sso'...
Checking out 95b32321 as master...
Skipping Git submodules setup
$ go get -u github.com/jstemmer/go-junit-report
$ go-test-runner ./... 2>&1 | $HOME/go/bin/go-junit-report > junit.xml
Uploading artifacts...
junit.xml: found 1 matching files
Uploading artifacts to coordinator... ok id=6263 responseStatus=201 Created token=y5BjCEZ8
ERROR: Job failed: exit code 1