build(deps): bump opentelemetry-api from 1.20.0 to 1.21.0

Bumps [opentelemetry-api](https://github.com/open-telemetry/opentelemetry-python) from 1.20.0 to 1.21.0.
- [Release notes](https://github.com/open-telemetry/opentelemetry-python/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-python/blob/main/CHANGELOG.md)
- [Commits](open-telemetry/opentelemetry-python@v1.20.0...v1.21.0)

---
updated-dependencies:
- dependency-name: opentelemetry-api
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -513,9 +513,9 @@ openpyxl==3.1.2 \
     --hash=sha256:a6f5977418eff3b2d5500d54d9db50c8277a368436f4e4f8ddb1be3422870184 \
     --hash=sha256:f91456ead12ab3c6c2e9491cf33ba6d08357d802192379bb482f1033ade496f5
     # via -r requirements/base.in
-opentelemetry-api==1.20.0 \
-    --hash=sha256:06abe351db7572f8afdd0fb889ce53f3c992dbf6f6262507b385cc1963e06983 \
-    --hash=sha256:982b76036fec0fdaf490ae3dfd9f28c81442a33414f737abc687a32758cdcba5
+opentelemetry-api==1.21.0 \
+    --hash=sha256:4bb86b28627b7e41098f0e93280fe4892a1abed1b79a19aec6f928f39b17dffb \
+    --hash=sha256:d6185fd5043e000075d921822fd2d26b953eba8ca21b1e2fa360dd46a7686316
     # via ddtrace
 packaging==23.2 \
     --hash=sha256:048fb0e9405036518eaaf48a55953c750c11e1a1b68e0dd1a9d62ed0c092cfc5 \