CI: master -> main

Some of these were missed when the default branch was renamed to main,
and as such, not all CI checks have been running since then.

.github/PULL_REQUEST_TEMPLATE.md

@@ -8,7 +8,7 @@
 
     https://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
 
-  - [https://raw.githubusercontent.com/fvwmorg/fvwm3/master/doc/README]Documentation updated (where appropriate)
+  - [https://raw.githubusercontent.com/fvwmorg/fvwm3/main/doc/README]Documentation updated (where appropriate)
 
   - Style guide followed (try and match the surrounding code where possible)
 
@@ -32,4 +32,4 @@ If there is more than one issue fixed then use:
 
 ```
 Fixes #XXX, fixes #YYY, fixes #ZZZ
-```
+```

.github/workflows/ccpp.yml

@@ -3,10 +3,10 @@ name: FVWM3 CI
 on:
     push:
         branches:
-            - master
+            - main
     pull_request:
         branches:
-            - master
+            - main
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -39,4 +39,4 @@ jobs:
           notice: false
           channel: "#fvwm"
           nickname: fvwm-gh
-          message: ${{ github.actor }} tagged ${{ github.repository }} ${{ github.event.ref }}
+          message: ${{ github.actor }} tagged ${{ github.repository }} ${{ github.event.ref }}

.github/workflows/release.yml

@@ -32,7 +32,7 @@ jobs:
           -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
           -H "X-GitHub-Api-Version: 2022-11-28" \
           https://api.github.com/repos/fvwmorg/fvwm3/releases/generate-notes \
-          -d '{"tag_name":"${{ github.event.inputs.versionRelease }}","target_commitish":"master","configuration_file_path":".github/release.yml"}' | \
+          -d '{"tag_name":"${{ github.event.inputs.versionRelease }}","target_commitish":"main","configuration_file_path":".github/release.yml"}' | \
                 jq -r '.body' >> ./tmp.out
         sed -i '2d' ./tmp.out
         sed -i "2r tmp.out" CHANGELOG.md
@@ -47,10 +47,10 @@ jobs:
       with:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        head: release/${{ github.event.inputs.versionRelease }}
-       base: master
+       base: main
        title: release ${{ github.event.inputs.versionRelease }}
        reviewers: ${{ github.event.issue.user.login }}
        body: |
            Hello,
            This PR was created in response to a release workflow running.
-           I've updated the version name and code commit: ${{ steps.make-commit.outputs.commit }}.
+           I've updated the version name and code commit: ${{ steps.make-commit.outputs.commit }}.