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azure-cosmos-db needs lower bound on base64

Fails with
```
(cd _build/default && /home/opam/.opam/4.08/bin/ocamlc.opt -w -40 -g -bin-annot -I src/.cosmos.objs/byte -I /home/opam/.opam/4.08/lib/asn1-combinators -I /home/opam/.opam/4.08/lib/astring -I /home/opam/.opam/4.08/lib/atd -I /home/opam/.opam/4.08/lib/atdgen -I /home/opam/.opam/4.08/lib/base -I /home/opam/.opam/4.08/lib/base/caml -I /home/opam/.opam/4.08/lib/base/shadow_stdlib -I /home/opam/.opam/4.08/lib/base64 -I /home/opam/.opam/4.08/lib/biniou -I /home/opam/.opam/4.08/lib/bytes -I /home/opam/.opam/4.08/lib/cohttp -I /home/opam/.opam/4.08/lib/cohttp-lwt -I /home/opam/.opam/4.08/lib/cohttp-lwt-unix -I /home/opam/.opam/4.08/lib/conduit -I /home/opam/.opam/4.08/lib/conduit-lwt -I /home/opam/.opam/4.08/lib/conduit-lwt-unix -I /home/opam/.opam/4.08/lib/cryptokit -I /home/opam/.opam/4.08/lib/cstruct -I /home/opam/.opam/4.08/lib/cstruct-lwt -I /home/opam/.opam/4.08/lib/cstruct-sexp -I /home/opam/.opam/4.08/lib/easy-format -I /home/opam/.opam/4.08/lib/fieldslib -I /home/opam/.opam/4.08/lib/fmt -I /home/opam/.opam/4.08/lib/ipaddr -I /home/opam/.opam/4.08/lib/ipaddr/unix -I /home/opam/.opam/4.08/lib/logs -I /home/opam/.opam/4.08/lib/lwt -I /home/opam/.opam/4.08/lib/lwt/unix -I /home/opam/.opam/4.08/lib/magic-mime -I /home/opam/.opam/4.08/lib/mmap -I /home/opam/.opam/4.08/lib/netstring -I /home/opam/.opam/4.08/lib/netsys -I /home/opam/.opam/4.08/lib/nocrypto -I /home/opam/.opam/4.08/lib/ocaml/threads -I /home/opam/.opam/4.08/lib/parsexp -I /home/opam/.opam/4.08/lib/ppx_deriving/runtime -I /home/opam/.opam/4.08/lib/ppx_sexp_conv/runtime-lib -I /home/opam/.opam/4.08/lib/ptime -I /home/opam/.opam/4.08/lib/ptime/os -I /home/opam/.opam/4.08/lib/re -I /home/opam/.opam/4.08/lib/result -I /home/opam/.opam/4.08/lib/seq -I /home/opam/.opam/4.08/lib/sexplib -I /home/opam/.opam/4.08/lib/sexplib0 -I /home/opam/.opam/4.08/lib/stringext -I /home/opam/.opam/4.08/lib/tls -I /home/opam/.opam/4.08/lib/uchar -I /home/opam/.opam/4.08/lib/uri -I /home/opam/.opam/4.08/lib/uri/services -I /home/opam/.opam/4.08/lib/x509 -I /home/opam/.opam/4.08/lib/yojson -I /home/opam/.opam/4.08/lib/zarith -no-alias-deps -open Cosmos -o src/.cosmos.objs/byte/cosmos__Utility.cmo -c -impl src/utility.pp.ml)
File "src/utility.ml", line 28, characters 13-30:
28 | let key = Base64.decode_exn master_key in
^^^^^^^^^^^^^^^^^
Error: Unbound module Base64
```

Signed-off-by: Marcello Seri <marcello.seri@gmail.com>

Changed files
+5 -5
packages
azure-cosmos-db
azure-cosmos-db.0.1.2
azure-cosmos-db.0.1.3
azure-cosmos-db.0.1.4
azure-cosmos-db.0.1.5
azure-cosmos-db.0.1.6
+1 -1
packages/azure-cosmos-db/azure-cosmos-db.0.1.2/opam
···
"atdgen" {< "2.16.0"}
"ocsigenserver"
"ocamlnet"
-
"base64"
+
"base64" {>= "3.0.0"}
"uri"
"cohttp"
"cohttp-lwt-unix"
+1 -1
packages/azure-cosmos-db/azure-cosmos-db.0.1.3/opam
···
"atdgen" {< "2.16.0"}
"ocsigenserver"
"ocamlnet"
-
"base64"
+
"base64" {>= "3.0.0"}
"uri"
"cohttp"
"cohttp-lwt-unix"
+1 -1
packages/azure-cosmos-db/azure-cosmos-db.0.1.4/opam
···
"atdgen" {< "2.16.0"}
"ocsigenserver"
"ocamlnet"
-
"base64"
+
"base64" {>= "3.0.0"}
"uri"
"cohttp"
"cohttp-lwt-unix"
+1 -1
packages/azure-cosmos-db/azure-cosmos-db.0.1.5/opam
···
"lwt_ppx"
"atdgen" {< "2.16.0"}
"tls" {< "1.0.0"} | "ssl"
-
"base64"
+
"base64" {>= "3.0.0"}
"uri"
"cohttp"
"cohttp-lwt-unix"
+1 -1
packages/azure-cosmos-db/azure-cosmos-db.0.1.6/opam
···
"lwt_ppx"
"atdgen" {< "2.16.0"}
"tls" {< "1.0.0"} | "ssl"
-
"base64"
+
"base64" {>= "3.0.0"}
"uri"
"cohttp"
"cohttp-lwt-unix"