ci: point checkout + SDK insteadOf at git.flemming.ai

The Forgejo instance the modules and the chain-module-sdk dep
live on is reachable at git.flemming.ai (api/v1/version returns
SERVING); git.flemming.ws is a legacy host that no longer
resolves at the API level. Cargo.toml's git dep already uses
.ai — the CI workflow's checkout URL and the SDK insteadOf
rewrite now match, so cargo's git fetch can authenticate via
${{ secrets.MODULE_SDK_PAT }} the same way it was always meant
to. No behaviour change to the module code.

Signed-off-by: flemming-it <sf@flemming.it>

.forgejo/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
           cd "$GITHUB_WORKSPACE"
           git init -q
           git remote add origin \
-            "https://x-access-token:${GITHUB_TOKEN}@git.flemming.ws/${GITHUB_REPOSITORY}.git"
+            "https://x-access-token:${GITHUB_TOKEN}@git.flemming.ai/${GITHUB_REPOSITORY}.git"
           git fetch --depth=1 origin "$GITHUB_SHA"
           git checkout -q FETCH_HEAD
 
@@ -33,8 +33,8 @@ jobs:
           SDK_PAT: ${{ secrets.MODULE_SDK_PAT }}
         run: |
           git config --global \
-            "url.https://x-access-token:${SDK_PAT}@git.flemming.ws/.insteadOf" \
-            "https://git.flemming.ws/"
+            "url.https://x-access-token:${SDK_PAT}@git.flemming.ai/.insteadOf" \
+            "https://git.flemming.ai/"
 
       - name: Install system dependencies
         run: |