Try to avoid running GitHub Actions twice on release PRs

.github/workflows/release.yaml

@@ -2,10 +2,10 @@ name: release
 on:
   push:
     branches:
-    - release**
+    - 'release**'
   pull_request:
     branches:
-    - release**
+    - 'release**'
 jobs:
   datasets:
     name: datasets

.github/workflows/style.yaml

@@ -2,12 +2,10 @@ name: style
 on:
   push:
     branches:
-    - main
-    - release**
+    - '**'
   pull_request:
     branches:
-    - main
-    - release**
+    - '**'
 jobs:
   black:
     name: black

.github/workflows/tests.yaml

@@ -2,12 +2,10 @@ name: tests
 on:
   push:
     branches:
-    - main
-    - release**
+    - '**'
   pull_request:
     branches:
-    - main
-    - release**
+    - '**'
 jobs:
   mypy:
     name: mypy