chore(llmobs): fix type error for crew ai latest version

[lievan]

Fixes a TypeError with crewai>=1.121.0 caused by crew ai supporting empty context

Also updates the crewai version we test with to be a min compatible version with 1.121.0

Checklist

• PR author has checked that all the criteria below are met
• The PR description includes an overview of the change
• The PR description articulates the motivation for the change
• The change includes tests OR the PR description describes a testing strategy
• The PR description notes risks associated with the change, if any
• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• Reviewer has checked that all the criteria below are met
• Title is accurate
• All changes are related to the pull request's stated goal
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Newly-added code is easy to change
• Release note makes sense to a user of the library
• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[github-actions]

CODEOWNERS have been resolved as:

.riot/requirements/158ac30.txt                                          @DataDog/apm-python
.riot/requirements/16628a6.txt                                          @DataDog/apm-python
.riot/requirements/181e571.txt                                          @DataDog/apm-python
.riot/requirements/321c69b.txt                                          @DataDog/apm-python
.riot/requirements/8b0105d.txt                                          @DataDog/apm-python
.riot/requirements/f27aa11.txt                                          @DataDog/apm-python
releasenotes/notes/crewai-fix-8d66e3489f87d046.yaml                     @DataDog/apm-python
.riot/requirements/14e7a10.txt                                          @DataDog/apm-python
.riot/requirements/1538bcb.txt                                          @DataDog/apm-python
.riot/requirements/1f24364.txt                                          @DataDog/apm-python
.riot/requirements/213dcfe.txt                                          @DataDog/apm-python
.riot/requirements/55abc5e.txt                                          @DataDog/apm-python
ddtrace/llmobs/_integrations/crewai.py                                  @DataDog/ml-observability
lib-injection/sources/min_compatible_versions.csv                       @DataDog/apm-core-python
min_compatible_versions.csv                                             @DataDog/apm-core-python
riotfile.py                                                             @DataDog/apm-python

[github-actions]

Bootstrap import analysis

Comparison of import times between this PR and base.

Summary

The average import time from this PR is: 235 ± 3 ms.

The average import time from base is: 238 ± 3 ms.

The import time difference between this PR and base is: -2.4 ± 0.1 ms.

Import time breakdown

The following import paths have shrunk:

ddtrace.auto 2.001 ms (0.85%)

ddtrace.bootstrap.sitecustomize 1.324 ms (0.56%)

ddtrace.bootstrap.preload 1.324 ms (0.56%)

ddtrace.internal.remoteconfig.client 0.649 ms (0.28%)

ddtrace 0.677 ms (0.29%)

ddtrace.internal._unpatched 0.024 ms (0.01%)

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-05-27 15:38:09

Comparing candidate commit 08ee801 in PR branch evan.li/crewai-fix with baseline commit 0d1b115 in branch main.

Found 0 performance improvements and 4 performance regressions! Performance is the same for 460 metrics, 8 unstable metrics.

scenario:iast_aspects-ospathbasename_aspect

• 🟥 execution_time [+466.508ns; +707.934ns] or [+11.242%; +17.060%]

scenario:iast_aspects-ospathdirname_aspect

• 🟥 execution_time [+1.045µs; +1.205µs] or [+22.705%; +26.182%]

scenario:iast_aspects-ospathsplit_aspect

• 🟥 execution_time [+748.445ns; +947.492ns] or [+15.536%; +19.668%]

scenario:iast_aspects-strip_aspect

• 🟥 execution_time [+1.515µs; +1.622µs] or [+11.513%; +12.323%]

[Yun-Kim]

If you can add a quick repro case that would be great, but otherwise lgtm!

[lievan]

closing for #13511