chore(deps): update dependency altcha to v2

Author: renovate[bot]

requirements.txt

@@ -1,7 +1,7 @@
 aeidon==1.16
 ahocorasick-rs==1.0.3
 aliyun-python-sdk-alimt==3.2.0
-altcha==1.0.0
+altcha==2.0.0
 argon2-cffi==25.1.0
 borgbackup==1.4.4
 boto3==1.42.89