RFR: CODETOOLS-7903355: JMH: Drop support for JDK 7

[Aleksey Shipilev]

On Fri, 14 Oct 2022 07:28:51 GMT, Róbert Papp <duke at openjdk.org> wrote:

>> Head JDK 20-ea does not support building with -source/target 7 anymore. JDK 7 is very old and unlikely to be used widely. We can bump the minimal version to JDK 8 to get... ahem... all the new features that release brings! 
>> 
>> If you have a strong opinion that we should **not** drop JDK 7 support, please speak up soon.
>
> pom.xml line 178:
> 
>> 176:                         <compilerVersion>1.8</compilerVersion>
>> 177:                         <source>1.8</source>
>> 178:                         <target>1.8</target>
> 
> Don't know maven much, is this going to be inherited to `<build>` in child poms?

Yes, inheritance in submodules is one of the points of `<pluginManagement>`.

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PR: https://git.openjdk.org/jmh/pull/86