Update some test environments to 3.10

Fixes open-telemetry#3148

Author: ocelotl

tox.ini

@@ -189,7 +189,7 @@ commands =
   mypyinstalled: mypy --install-types --non-interactive --namespace-packages opentelemetry-api/tests/mypysmoke.py --strict
 
 [testenv:spellcheck]
-basepython: python3.9
+basepython: python3.10
 recreate = True
 deps =
   codespell
@@ -254,7 +254,7 @@ commands =
   sphinx-build -E -a -W -b html -T . _build/html
 
 [testenv:tracecontext]
-basepython: python3.9
+basepython: python3.10
 deps =
   # needed for tracecontext
   aiohttp~=3.6
@@ -312,7 +312,7 @@ commands_post =
   docker-compose down -v
 
 [testenv:public-symbols-check]
-basepython: python3.9
+basepython: python3.10
 recreate = True
 deps =
   GitPython