Symphony-bdk-python

**Changes**
350 Add a new auth_token property to AuthSession from broHeryk
347 Readme update from Haoyu-Gao

**Fixes**
344 from anthony-symphony

:exclamation: Breaking change
Due to a bug where a Form's values in Symphony Element Actions were being automatically converted, developers were not able to access the actual value inputted by the user. This bug has been resolved in 2.8.0.

However as values no longer being automatically converted, this may break existing code where it was expecting the value after it had been converted. To resolve this please check for any instances of this and convert the Symphony Element Action Form values as necessary before continuing on to the remaining workflow.

**Changes**
339 Update cryptography aiohttp urllib3 from anthony-symphony

**Fixes**
333
335
336

**Fixes**
330 Expose blast to OBO by anthony-symphony in https://github.com/finos/symphony-bdk-python/pull/330.

**Fixes**
327 DF2 tag removal by ystxn in https://github.com/finos/symphony-bdk-python/pull/328.

2.6.0-latest
**Fixes**
320 Prevent using bot username as Datafeed internal tag.

**Dependency upgrades**
318 Feature/security scanning

**Fixes**
311 Fix Datahose loop

**Dependency upgrades**
315 Fix Security CVE-2022-3602