Bump billiard from 3.6.1.0 to 3.6.2.0 (#7333)

Bumps [billiard](https://github.com/celery/billiard) from 3.6.1.0 to 3.6.2.0.
- [Release notes](https://github.com/celery/billiard/releases)
- [Changelog](https://github.com/celery/billiard/blob/master/CHANGES.txt)
- [Commits](celery/billiard@3.6.1...3.6.2.0)

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

Author: dependabot-preview[bot]

requirements/main.txt

@@ -48,9 +48,9 @@ bcrypt==3.1.7 \
     --hash=sha256:cb93f6b2ab0f6853550b74e051d297c27a638719753eb9ff66d1e4072be67133 \
     --hash=sha256:d7bdc26475679dd073ba0ed2766445bb5b20ca4793ca0db32b399dccc6bc84b7 \
     --hash=sha256:ff032765bb8716d9387fd5376d987a937254b0619eff0972779515b5c98820bc
-billiard==3.6.1.0 \
-    --hash=sha256:01afcb4e7c4fd6480940cfbd4d9edc19d7a7509d6ada533984d0d0f49901ec82 \
-    --hash=sha256:b8809c74f648dfe69b973c8e660bcec00603758c9db8ba89d7719f88d5f01f26
+billiard==3.6.2.0 \
+    --hash=sha256:26fd494dc3251f8ce1f5559744f18aeed427fdaf29a75d7baae26752a5d3816f \
+    --hash=sha256:f4e09366653aa3cb3ae8ed16423f9ba1665ff426f087bcdbbed86bf3664fe02c
 bleach==3.1.0 \
     --hash=sha256:213336e49e102af26d9cde77dd2d0397afabc5a6bf2fed985dc35b5d1e285a16 \
     --hash=sha256:3fdf7f77adcf649c9911387df51254b813185e32b2c6619f690b593a617e19fa