Exclude tox env spark

The Python package `pyspark` is not packaged; disable the `spark` tox
environment.

python-sentry-sdk.spec

@@ -212,6 +212,7 @@ Summary:        %{summary}
 # requests: require network
 # rq: no_fakeredis
 # socket: require network
+# spark: no_pyspark
 # starberry: no_strawberry
 # trytond: no_trytond
 %global toxenvs_excluded %{shrink:
@@ -239,6 +240,7 @@ Summary:        %{summary}
   %{toxenv}-rq
   %{toxenv}-requests
   %{toxenv}-socket
+  %{toxenv}-spark
   %{toxenv}-strawberry
   %{toxenv}-trytond
   %{nil}}