chore(deps): update dependency boto3 to v1.39.15 (#3491)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

requirements.txt

@@ -4,7 +4,7 @@ aliyun-python-sdk-alimt==3.2.0
 altcha==0.2.0
 argon2-cffi==25.1.0
 borgbackup==1.4.1
-boto3==1.39.14
+boto3==1.39.15
 celery==5.5.3
 certifi>=2023.7.22 # not directly required, pinned by Snyk to avoid a vulnerability
 # For Argon2 and misaka