release/7.6.2

We are pleased to announce the release of version 7.6.2
of the Cooperative Computing Tools from the University of Notre Dame,
including TaskVine, Work Queue, Makeflow, Parrot, Chirp, and other software.

• Docs: https://cctools.readthedocs.io/
• Download: http://ccl.cse.nd.edu/software/download
• Forum: http://ccl.cse.nd.edu/community/forum

This is a bug fix release that addresses several minor issues:

Bug Fixes

• dttools: fix too many open files by @tphung3 in #3416
• Vine Futures Executor by @BarrySlyDelgado in #3403
• TaskVine: fix FunctionCall API, update example, and add test by @tphung3 in #3418
• Vine: Removed Serverless Test by @dthain in #3426
• TaskVine + Poncho: Add env option serverless by @tphung3 in #3427
• adds del dummy method to WorkQueue by @btovar in #3428
• Vine: Fix worker crash when using serverless. by @dthain in #3435
• Vine: Fix two core bugs. by @dthain in #3437

Test Infrastructure

• Build: Add Python deps to docker images. by @dthain in #3421
• Vine: Remove test for poncho to force test run. by @dthain in #3422
• Parrot: Fix test cases. by @dthain in #3424
• Build: Add Conda developer platform. by @dthain in #3423
• Parrot: Fix test cases by @dthain in #3425

Full Changelog: release/7.6.1...release/7.6.2