fix(ci): pin versions of sphinx dependencies to unlock ci [backport 1.20] (#8103)

Backport 21aad5d from #8102 to 1.20.

Many sphinx dependencies were just updated with patch versions that drop
sphinx 4.x compatiblity.
Pins those versions to unlock the ci.

## Checklist

- [x] Change(s) are motivated and described in the PR description.
- [x] Testing strategy is described if automated tests are not included
in the PR.
- [x] Risk is outlined (performance impact, potential for breakage,
maintainability, etc).
- [x] Change is maintainable (easy to change, telemetry, documentation).
- [x] [Library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html)
are followed. If no release note is required, add label
`changelog/no-changelog`.
- [x] Documentation is included (in-code, generated user docs, [public
corp docs](https://github.com/DataDog/documentation/)).
- [x] Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## Reviewer Checklist

- [x] Title is accurate.
- [x] No unnecessary changes are introduced.
- [x] Description motivates each change.
- [x] Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes unless absolutely necessary.
- [x] Testing strategy adequately addresses listed risk(s).
- [x] Change is maintainable (easy to change, telemetry, documentation).
- [x] Release note makes sense to a user of the library.
- [x] Reviewer has explicitly acknowledged and discussed the performance
implications of this PR as reported in the benchmarks PR comment.
- [x] Backport labels are set in a manner that is consistent with the
[release branch maintenance
policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)
- [x] If this PR touches code that signs or publishes builds or
packages, or handles credentials of any kind, I've requested a review
from `@DataDog/security-design-and-guidance`.
- [x] This PR doesn't touch any of that.

Co-authored-by: Christophe Papazian <[email protected]>

Author: github-actions[bot]

hatch.toml

@@ -67,6 +67,12 @@ features = ["opentracing"]
 extra-dependencies = [
     "reno[sphinx]~=3.5.0",
     "sphinx~=4.0",
+    "sphinxcontrib-applehelp<1.0.8",
+    "sphinxcontrib-devhelp<1.0.6",
+    "sphinxcontrib-htmlhelp<2.0.5",
+    "sphinxcontrib-devhelp<1.0.6",
+    "sphinxcontrib-serializinghtml<1.1.10",
+    "sphinxcontrib-qthelp<1.0.7",
     "sphinxcontrib-spelling==7.7.0",
     "PyEnchant==3.2.2",
     "sphinx-copybutton==0.5.1",