chore: bump requests, chardet and dropbox (#22805)

Backports #21080

requirements.txt

@@ -4,14 +4,14 @@ bleach-allowlist~=1.0.3
 bleach~=3.3.0
 boto3~=1.17.53
 braintree~=4.20.0
-chardet~=4.0.0
+chardet~=5.1.0
 Click~=7.1.2
 filelock~=3.8.0
 colorama~=0.4.4
 coverage==5.5
 croniter~=1.0.11
 cryptography~=3.4.7
-dropbox~=11.7.0
+dropbox~=11.36.0
 email-reply-parser~=0.5.12
 Faker~=8.1.0
 future==0.18.2
@@ -62,7 +62,7 @@ rauth~=0.7.3
 razorpay~=1.2.0
 redis~=3.5.3
 requests-oauthlib~=1.3.0
-requests~=2.25.1
+requests~=2.31.0
 RestrictedPython~=5.4
 rq~=1.8.0
 rsa>=4.1 # not directly required, pinned by Snyk to avoid a vulnerability