git: openjdk/jdk11u-dev: 8282225: GHA: Allow one concurrent run per PR only

[Aleksey Shipilev]

Changeset: 194b66f6
Author:    Aleksey Shipilev <shade at openjdk.org>
Date:      2022-03-10 13:19:04 +0000
URL:       https://git.openjdk.java.net/jdk11u-dev/commit/194b66f6a72437345c458e747e24beb46352537a

8282225: GHA: Allow one concurrent run per PR only

Backport-of: aaab2cb41666af8520fd01de70e2c4f9c87ef5fd

! .github/workflows/submit.yml