build: use --deepen in place of --depth during fetches in rebasing

Previously we used `--depth` to ensure that enough commits were included in the repository to effectively
perform create changlogs.  However, using `--depth` sets the depth of the repository, and if the repository
previously was unshallow, it because a shallow repository.  Instead by using deepen, the depth will be
increased by the provided value. This will ensure that the enough commits are included and will be a noop
if an unshallow repo is deepened further.

tools/local-actions/changelog/lib/main.ts

@@ -110,7 +110,7 @@ function writeAndAddToGit(filePath: string, contents: string) {
 function getLatestRefFromUpstream(branchOrTag: string) {
   try {
     const git = AuthenticatedGitClient.get();
-    git.runGraceful(['fetch', git.getRepoGitUrl(), branchOrTag, '--depth=250']);
+    git.runGraceful(['fetch', git.getRepoGitUrl(), branchOrTag, '--deepen=250']);
     return git.runGraceful(['rev-parse', 'FETCH_HEAD']).stdout.trim();
   } catch {
     core.error(`Unable to retrieve '${branchOrTag}' from upstream`);

tools/local-actions/changelog/main.js

@@ -54772,7 +54772,7 @@ function writeAndAddToGit(filePath, contents) {
 function getLatestRefFromUpstream(branchOrTag) {
   try {
     const git = authenticated_git_client_1.AuthenticatedGitClient.get();
-    git.runGraceful(["fetch", git.getRepoGitUrl(), branchOrTag, "--depth=250"]);
+    git.runGraceful(["fetch", git.getRepoGitUrl(), branchOrTag, "--deepen=250"]);
     return git.runGraceful(["rev-parse", "FETCH_HEAD"]).stdout.trim();
   } catch {
     core.error(`Unable to retrieve '${branchOrTag}' from upstream`);