GOBBLIN-1122: Bump up helix-lib version

[sv2000]

Dear Gobblin maintainers,

Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below!

JIRA

• My PR addresses the following Gobblin JIRA issues and references them in the PR title. For example, "[GOBBLIN-XXX] My Gobblin PR"
  • https://issues.apache.org/jira/browse/GOBBLIN-1122

Description

• Here are some details about my PR, including screenshots (if applicable):
  Bump up helix dependency version to 0.9.4.

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:
  Trivial change

Commits

• My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

[codecov-io]

Codecov Report

Merging #2962 into master will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2962      +/-   ##
============================================
- Coverage     45.64%   45.63%   -0.01%     
+ Complexity     9195     9194       -1     
============================================
  Files          1938     1938              
  Lines         73520    73520              
  Branches       8125     8125              
============================================
- Hits          33556    33553       -3     
- Misses        36842    36843       +1     
- Partials       3122     3124       +2     

Impacted Files	Coverage Δ	Complexity Δ
...e/gobblin/runtime/app/ServiceBasedAppLauncher.java	43.68% <0.00%> (-1.95%)	12.00% <0.00%> (ø%)
.../org/apache/gobblin/metrics/RootMetricContext.java	78.12% <0.00%> (-1.57%)	15.00% <0.00%> (-1.00%)
...e/gobblin/runtime/locks/ZookeeperBasedJobLock.java	63.33% <0.00%> (-1.12%)	15.00% <0.00%> (-1.00%)
.../apache/gobblin/runtime/api/JobExecutionState.java	79.43% <0.00%> (-0.94%)	24.00% <0.00%> (ø%)
...lin/util/filesystem/FileSystemInstrumentation.java	92.85% <0.00%> (ø)	4.00% <0.00%> (+1.00%)
.../org/apache/gobblin/cluster/GobblinTaskRunner.java	67.91% <0.00%> (+0.37%)	33.00% <0.00%> (ø%)
...a/org/apache/gobblin/util/limiter/NoopLimiter.java	60.00% <0.00%> (+20.00%)	3.00% <0.00%> (+1.00%)

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