Bump yarl from 1.20.1 to 1.21.0

---
updated-dependencies:
- dependency-name: yarl
  dependency-version: 1.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pyproject.toml

@@ -17,7 +17,7 @@ dependencies = [
   "base58~=2.1.1",
   # temporary to fix transitive dependency issues
   "multidict<7.0.0",
-  "yarl==1.20.1",
+  "yarl==1.21.0",
 
   # indy_vdr
   # Error loading library: indy_vdr specified version because it occurs when installing as pip3 install indy-vdr.