7903462: JMH: Upgrade pre-integration workflows

[shipilev]

JDK 20 was released, and we need to start tracking 21-ea.

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Progress

• Change must not contain extraneous whitespace
• Change must be properly reviewed (1 review required, with at least 1 Committer)

Issue

• CODETOOLS-7903462: JMH: Upgrade pre-integration workflows

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jmh.git pull/101/head:pull/101
$ git checkout pull/101

Update a local copy of the PR:
$ git checkout pull/101
$ git pull https://git.openjdk.org/jmh.git pull/101/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 101

View PR using the GUI difftool:
$ git pr show -t 101

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jmh/pull/101.diff

Webrev

Link to Webrev Comment

[bridgekeeper]

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[mlbridge]

Webrevs

• 03: Full - Incremental (ffcfa7b3)
• 02: Full - Incremental (bfbab2fe)
• 01: Full - Incremental (f599e484)
• 00: Full (cf8e7cb9)

[shipilev]

Stalled: waiting for setup-java to get us 21-ea from Temurin.