Update dependencies (#17)

Author: github-actions[bot]

src/giteaVersion.ts

@@ -1,4 +1,4 @@
-import { SemVer } from "https://deno.land/std@0.180.0/semver/mod.ts";
+import { SemVer } from "https://deno.land/std@0.181.0/semver/mod.ts";
 
 export class GiteaVersion {
   majorMinorVersion: string;

src/github.ts

@@ -1,4 +1,4 @@
-import * as semver from "https://deno.land/std@0.180.0/semver/mod.ts";
+import * as semver from "https://deno.land/std@0.181.0/semver/mod.ts";
 import { getPrBranchName } from "./git.ts";
 import { GiteaVersion } from "./giteaVersion.ts";
 

src/webhook.ts

@@ -1,4 +1,4 @@
-import { serve } from "https://deno.land/std@0.180.0/http/server.ts";
+import { serve } from "https://deno.land/std@0.181.0/http/server.ts";
 import { triggerBackportAction } from "./github.ts";
 
 if (Deno.env.get("BACKPORTER_GITHUB_TOKEN") === undefined) {