chore: rewire some master occurences (#9379)

(main for a few in contributing; doesn't exist yet but will, soon)

.changeset/config.json

@@ -1,11 +1,11 @@
 {
-  "$schema": "https://unpkg.com/@changesets/config@2.3.0/schema.json",
-  "changelog": ["@svitejs/changesets-changelog-github-compact", { "repo": "sveltejs/svelte" }],
-  "commit": false,
-  "fixed": [],
-  "linked": [],
-  "access": "public",
-  "baseBranch": "master",
-  "bumpVersionsWithWorkspaceProtocolOnly": true,
-  "ignore": ["!(@sveltejs/*|svelte)"]
+	"$schema": "https://unpkg.com/@changesets/config@2.3.0/schema.json",
+	"changelog": ["@svitejs/changesets-changelog-github-compact", { "repo": "sveltejs/svelte" }],
+	"commit": false,
+	"fixed": [],
+	"linked": [],
+	"access": "public",
+	"baseBranch": "svelte-4",
+	"bumpVersionsWithWorkspaceProtocolOnly": true,
+	"ignore": ["!(@sveltejs/*|svelte)"]
 }

.github/workflows/ci.yml

@@ -1,7 +1,7 @@
 name: CI
 on:
   push:
-    branches: [master]
+    branches: [svelte-4]
   pull_request:
 permissions:
   contents: read # to fetch code (actions/checkout)

.github/workflows/release.yml

@@ -3,7 +3,7 @@ name: Release
 on:
   push:
     branches:
-      - master
+      - svelte-4
 
 permissions: {}
 jobs:

CONTRIBUTING.md

@@ -81,7 +81,7 @@ Small pull requests are much easier to review and more likely to get merged.
 
 ### Creating a branch
 
-Fork [the repository](https://github.com/sveltejs/svelte) and create your branch from `master`. If you've never sent a GitHub pull request before, you can learn how from [this free video series](https://egghead.io/courses/how-to-contribute-to-an-open-source-project-on-github).
+Fork [the repository](https://github.com/sveltejs/svelte) and create your branch from `main`. If you've never sent a GitHub pull request before, you can learn how from [this free video series](https://egghead.io/courses/how-to-contribute-to-an-open-source-project-on-github).
 
 ### Testing
 
@@ -130,7 +130,7 @@ Please make sure the following is done when submitting a pull request:
 1. Make sure your code lints (`pnpm lint`).
 1. Make sure your tests pass (`pnpm test`).
 
-All pull requests should be opened against the `master` branch. Make sure the PR does only one thing, otherwise please split it.
+All pull requests should be opened against the `main` branch. Make sure the PR does only one thing, otherwise please split it.
 
 #### Breaking changes