Update @changesets/ghcommit to v3 beta (#675)

Co-authored-by: Mateusz Burzyński <mateuszburzynski@gmail.com>

src/github.ts

@@ -2,7 +2,7 @@ import { Buffer } from "node:buffer";
 import * as core from "@actions/core";
 import { exec, getExecOutput } from "@actions/exec";
 import { context } from "@actions/github";
-import { commitChangesFromRepo } from "@changesets/ghcommit/git";
+import { commitChangesSinceBase } from "@changesets/ghcommit";
 import { setupOctokit, type Octokit } from "./octokit.ts";
 
 export type CommitMode = "git-cli" | "github-api";
@@ -146,14 +146,7 @@ export class GitHub {
 
   async pushChanges({ branch, message }: { branch: string; message: string }) {
     if (this.commitMode === "github-api") {
-      /**
-       * Only add files form the current working directory
-       *
-       * This will emulate the behavior of `git add .`,
-       * used in {@link commitAll}.
-       */
-      const addFromDirectory = this.cwd;
-      return commitChangesFromRepo({
+      await commitChangesSinceBase({
         octokit: this.octokit,
         ...context.repo,
         branch,
@@ -162,8 +155,8 @@ export class GitHub {
           commit: context.sha,
         },
         cwd: this.cwd,
-        force: true,
       });
+      return;
     }
     if (!(await checkIfClean({ cwd: this.cwd }))) {
       await commitAll(message, { cwd: this.cwd });

src/run.test.ts

@@ -20,7 +20,7 @@ vi.mock("@actions/github", () => ({
     graphql: mockedGraphql,
   }),
 }));
-vi.mock("@changesets/ghcommit/git");
+vi.mock("@changesets/ghcommit");
 
 let mockedGithubMethods = {
   pulls: {

src/run.ts

@@ -321,13 +321,6 @@ export async function runVersion({
     !!preState ? ` (${preState.tag})` : ""
   }`;
 
-  /**
-   * Fetch any existing pull requests that are open against the branch,
-   * before we push any changes that may inadvertently close the existing PRs.
-   *
-   * (`@changesets/ghcommit` has to reset the branch to the same commit as the base,
-   * which GitHub will then react to by closing the PRs)
-   */
   const existingPullRequests = await octokit.rest.pulls.list({
     ...context.repo,
     state: "open",