minor #20985 [DI] update changelog and upgrade files (xabbuh, javiereguiluz)
minor #20985 [DI] update changelog and upgrade files (xabbuh, javiereguiluz)

This PR was merged into the 3.3-dev branch.

Discussion
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[DI] update changelog and upgrade files

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #20634
| License       | MIT
| Doc PR        |

Commits
-------

ad7afe0 Added a needed blank line
d2b4996 [DI] update changelog and upgrade files

symfony/dependency-injection,symfony/DependencyInjection