SyncProgress() fails unmarshalling in Geth v1.10.14

[jclapis]

System information

Geth version:

• Client: v1.10.14
• Library: works in v1.10.13, fails in v1.10.14
  OS & Version: Linux x64 and ARM64

Expected behaviour

ethclient.Client.SyncProgress(context.Background()) should return a pointer to a populated ethereum.SyncProgress object.

Actual behaviour

The function returns the following error:
json: cannot unmarshal string into Go struct field SyncProgress.CurrentBlock of type uint64

This may be the same problem as #24176, though this report is for the current release (v1.10.14) and is part of the library itself regardless of mobile / desktop platform.

This was likely caused by the changes to ethclient/ethclient.go's unmarshaling code in #23576:
https://github.com/ethereum/go-ethereum/pull/23576/files#diff-1053ae80885a491cefa0ab360c605e7abbcec41fbb620c070a132c58a3bd6cac

Steps to reproduce the behaviour

Sample code:

package main

import (
	"context"
	"fmt"
	"os"

	"github.com/ethereum/go-ethereum/ethclient"
)

func main() {

    eth1Address := "http://localhost:8545"

    // Connect to ETH1
    ethClient, err := ethclient.Dial(eth1Address)
    if err != nil {
        fmt.Printf("Error connecting to ETH1 client on %s: %s\n", eth1Address, err.Error())
        os.Exit(1)
    }

    progress, err := ethClient.SyncProgress(context.Background())
    if err != nil {
        fmt.Printf("Error getting sync: %s\n", err.Error())
        os.Exit(1)
    }

    fmt.Println(progress)
    p := float64(progress.CurrentBlock - progress.StartingBlock) / float64(progress.HighestBlock - progress.StartingBlock)
    if p > 1 {
        p = 1
    } 
    
    fmt.Printf("Progress: %.2f\n", p)

}

Output when importing github.com/ethereum/go-ethereum@v1.10.13:

&{0 2199239 6133456 0 0}
Progress: 0.36

Output when importing github.com/ethereum/go-ethereum@v1.10.14:

Error getting sync: json: cannot unmarshal string into Go struct field SyncProgress.CurrentBlock of type uint64