Allow use of Java 11

[lcampos]

What does this PR do?

Allow usage of Java 11 for Apex language server

What issues does this PR fix or reference?

[lcampos]

Using build 11. allows users to use either Java 11 or OpenJDK 11.

[codecov]

Codecov Report

Merging #1275 into develop will decrease coverage by 0.02%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop    #1275      +/-   ##
===========================================
- Coverage     72.8%   72.77%   -0.03%     
===========================================
  Files          202      202              
  Lines         7405     7406       +1     
  Branches       773      774       +1     
===========================================
- Hits          5391     5390       -1     
- Misses        1849     1850       +1     
- Partials       165      166       +1

Impacted Files	Coverage Δ
...kages/salesforcedx-vscode-apex/src/requirements.ts	28.57% <0%> (-0.7%)	⬇️
...forcedx-vscode-core/src/channels/channelService.ts	83.33% <0%> (-2.39%)	⬇️

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[salesforce-cla]

Thanks for the contribution! Unfortunately we can't verify the commit author(s): Luis Campos <l***@s***.com>. One possible solution is to add that email to your GitHub account. Alternatively you can change your commits to another email and force push the change. After getting your commits associated with your GitHub account, refresh the status of this Pull Request.