Fix git protocol usage (#20464)

Prevents this:
```
+ git clone git://github.com/matrix-org/matrix-js-sdk.git matrix-js-sdk --branch develop --depth 1
Cloning into 'matrix-js-sdk'...
fatal: remote error:
  The unauthenticated git protocol on port 9418 is no longer supported.
Please see https://github.blog/2021-09-01-improving-git-protocol-security-github/ for more information.
```

scripts/fetch-develop.deps.sh

@@ -25,7 +25,7 @@ function clone() {
     if [ -n "$branch" ]
     then
         echo "Trying to use $org/$repo#$branch"
-        git clone git://github.com/$org/$repo.git $repo --branch $branch \
+        git clone https://github.com/$org/$repo.git $repo --branch $branch \
             "${GIT_CLONE_ARGS[@]}"
         return $?
     fi