chore: fixing up the typescript issue and fix up changeset description

Signed-off-by: blam <ben@blam.sh>

.changeset/purple-rocks-explode.md

@@ -2,4 +2,4 @@
 '@backstage/integration': patch
 ---
 
-Fixed bug on when compared in organzation name on github
+Fixed bug for comparing Organization name in `GithubCredentialsProvider`

packages/integration/src/github/GithubCredentialsProvider.ts

@@ -129,7 +129,7 @@ class GithubAppManager {
   private async getInstallationData(owner: string): Promise<InstallationData> {
     const allInstallations = await this.getInstallations();
     const installation = allInstallations.find(
-      inst => inst.account?.login.toLowerCase() === owner.toLowerCase(),
+      inst => inst.account?.login?.toLowerCase() === owner.toLowerCase(),
     );
     if (installation) {
       return {