perf(ci): Skip py3.14 builds for confluent-kafka 2.11.1 and sentry-streams 0.0.39 (#2359)

Both versions fail on every build for Python 3.14 and are the lone
stragglers in their package families (confluent-kafka 2.12.2+ and
sentry-streams 0.0.40+ already build on 3.14), so restricting them to
<3.14 removes ~8 min of wasted work per build.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: lcian

packages.ini

@@ -334,6 +334,7 @@ apt_requires =
     wget
 brew_requires = wget
 custom_prebuild = prebuild/librdkafka v2.8.0
+python_versions = <3.14
 [confluent-kafka==2.12.2]
 apt_requires =
     patch
@@ -3573,6 +3574,7 @@ python_versions = <3.14
 [sentry-streams==0.0.38]
 python_versions = <3.14
 [sentry-streams==0.0.39]
+python_versions = <3.14
 [sentry-streams==0.0.40]
 [sentry-streams==0.0.41]
 [sentry-streams==0.0.42]