GHA: disable permissions where missing

Reviewed-by: Daniel Stenberg
Closes #13306

.github/workflows/badwords.yml

@@ -15,6 +15,8 @@ on:
     branches:
     - master
 
+permissions: {}
+
 jobs:
   check:
 

.github/workflows/codespell.yml

@@ -20,6 +20,8 @@ on:
       - 'src/**'
       - 'include/**'
 
+permissions: {}
+
 jobs:
   codespell:
     runs-on: ubuntu-latest

.github/workflows/distcheck.yml

@@ -17,6 +17,8 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
   cancel-in-progress: true
 
+permissions: {}
+
 jobs:
   maketgz-and-verify-in-tree:
     runs-on: ubuntu-latest

.github/workflows/man-examples.yml

@@ -21,6 +21,8 @@ on:
       - 'docs/libcurl/opts/*.3'
       - '.github/scripts/verify-examples.pl'
 
+permissions: {}
+
 jobs:
   verify:
     runs-on: ubuntu-latest

.github/workflows/synopsis.yml

@@ -17,6 +17,8 @@ on:
     paths:
       - 'docs/libcurl/curl_*.3'
 
+permissions: {}
+
 jobs:
   verify:
     runs-on: ubuntu-latest