fix(ci): revert rembg to 2.0.62 (2.0.75 requires numpy>=2.3)

rembg 2.0.75 pulls in numpy>=2.3.0 which conflicts with our pinned
numpy==1.26.4 and would break the entire AI dependency chain. The two
rembg CVEs (SSRF + path traversal) are in its server/CLI components
which we don't use; they're already in the pip-audit ignore list.

docker/feature-manifest.json

@@ -9,7 +9,7 @@
       "description": "Remove image backgrounds with AI",
       "estimatedSize": "4-5 GB",
       "packages": {
-        "common": ["rembg==2.0.75"],
+        "common": ["rembg==2.0.62"],
         "amd64": ["onnxruntime-gpu==1.20.1", "mediapipe>=0.10.21"],
         "arm64": ["onnxruntime==1.20.1", "mediapipe>=0.10.18"]
       },

packages/ai/python/requirements-gpu.txt

@@ -1,4 +1,4 @@
-rembg==2.0.75
+rembg==2.0.62
 realesrgan==0.3.0
 paddleocr==2.9.1
 paddlepaddle-gpu==3.0.0

packages/ai/python/requirements.txt

@@ -1,4 +1,4 @@
-rembg[cpu]==2.0.75
+rembg[cpu]==2.0.62
 realesrgan==0.3.0
 paddleocr[doc-parser]>=3.4.0,<3.5.0
 paddlepaddle>=3.0.0,<3.1.0