Dedupe manifest: remove duplicate ep49 (a11y-03) and ep79 (ch-22)

Both entries were accidentally listed twice with identical content. Reduces companion count from 60 to 58 (correct value).

Author: GitHub Workshop Bot

podcasts/manifest.json

@@ -663,19 +663,6 @@
         "audio":  "ch-22-what-comes-next.mp3",
         "status":  "bundle-ready"
     },
-    {
-        "number":  49,
-        "slug":  "github-accessibility-and-open-source",
-        "title":  "GitHub Accessibility and Open Source at Scale",
-        "description":  "Connecting capstone work to GitHub\u0027s accessibility program and open source at scale.",
-        "duration":  "8-10 min",
-        "sources":  [
-                        "21-github-accessibility-and-open-source.md"
-                    ],
-        "bundle":  "a11y-03-github-accessibility-and-open-source.md",
-        "audio":  "a11y-03-github-accessibility-and-open-source.mp3",
-        "status":  "bundle-ready"
-    },
     {
         "number":  50,
         "slug":  "advanced-git-operations",
@@ -766,18 +753,5 @@
         "bundle":  "a11y-04-document-developer-tools.md",
         "audio":  "a11y-04-document-developer-tools.mp3",
         "status":  "bundle-ready"
-    },
-    {
-        "number":  79,
-        "slug":  "what-comes-next",
-        "title":  "What Comes Next",
-        "description":  "How to continue learning, contributing, and building confidence after the workshop.",
-        "duration":  "8-10 min",
-        "sources":  [
-                        "22-what-comes-next.md"
-                    ],
-        "bundle":  "ch-22-what-comes-next.md",
-        "audio":  "ch-22-what-comes-next.mp3",
-        "status":  "bundle-ready"
     }
 ]