Schema-salad

What's Changed
* Link existence checking should follow redirects by tetron in https://github.com/common-workflow-language/schema_salad/pull/450
* GitHub Actions: cancel outdated jobs by mr-c in https://github.com/common-workflow-language/schema_salad/pull/452
* synchronize recent changes from other CWL repos by mr-c in https://github.com/common-workflow-language/schema_salad/pull/454
* sync typeshed changes from cwltool by mr-c in https://github.com/common-workflow-language/schema_salad/pull/453
* Follow links by tetron in https://github.com/common-workflow-language/schema_salad/pull/455
* GA: use different concurrency groups per action by mr-c in https://github.com/common-workflow-language/schema_salad/pull/456
* Bump codecov/codecov-action from 1 to 2.1.0 by dependabot in https://github.com/common-workflow-language/schema_salad/pull/457
* Python Codegen: properly load SecondaryFiles DSL by mr-c in https://github.com/common-workflow-language/schema_salad/pull/458


**Full Changelog**: https://github.com/common-workflow-language/schema_salad/compare/8.2.20211015115235...8.2.20211020114435

What's Changed
* move black dependency to an extra by mr-c in https://github.com/common-workflow-language/schema_salad/pull/449


**Full Changelog**: https://github.com/common-workflow-language/schema_salad/compare/8.2.20211014150008...8.2.20211015115235

What's Changed
* pycodegen: collapse unions of identical types & format with black by mr-c in https://github.com/common-workflow-language/schema_salad/pull/443
* document the need for lockfile by mr-c in https://github.com/common-workflow-language/schema_salad/pull/444
* Test with Python 3.10 by mr-c in https://github.com/common-workflow-language/schema_salad/pull/445
* build binary wheels for Python 3.10 by mr-c in https://github.com/common-workflow-language/schema_salad/pull/446
* release-test: fixes for Python 3.10 compat by mr-c in https://github.com/common-workflow-language/schema_salad/pull/447
* use types from Black directly by mr-c in https://github.com/common-workflow-language/schema_salad/pull/448

**Full Changelog**: https://github.com/common-workflow-language/schema_salad/compare/8.2.20210918131710...8.2.20211014150008

USE_MYPYC: verbose 776fdb4 mr-c

pycodegen: return a plain dictionary from save() 54458a4 mr-c

improve support for rdflib > 5 3aa5aa1 mr-c

resolver: inject fewer IDs (430) a6e2c34 mr-c

codegen: place 'class' field early 8cbc01c mr-c

pycodgen
fix loading of long form secondaryfiles (427) b2abeb5 mr-c
deal with anonymous types better (428) 5c86585 mr-c

javacodegen
singular secondaryFiles long form entry (431) 87394ba mr-c
better baseURIs 2c81f4e mr-c
improve the Validator CLI d9ef0e mr-c
tidy up pom.xml with xmllint --format 8c63791 mr-c

document exception sources better f1f465c mr-c

Update rdflib-jsonld requirement from <0.6.0,>=0.4.0 to >=0.4.0,<0.7.0 dependabot 3ed19d6

Add linux aarch64 wheel build support (420) 5569e28 odidev mr-c
Build mypyc-enable Alpine linux docker container & publish it 07aab3a 2452fc2 9fa9171 odidev mr-c

Java codegen: cope with anonymous types a9f213c mr-c

JSON dumping: cope with datetimes when dumping c1a1fc8 49d107b mr-c
YAML loading: avoid datetime objects e2479c4 mr-c