Update remote-writer-sender opentelemetry collector to reflect updates

[bmpandrade]

This PR tries to reflect a few changes:

1. Update to latest of opentelemetry-collector
2. Update the repository from where to fetch the release, since opentelemetry-collector-releases is now the source.
3. Update the --metrics.addr=:0 to reflect the coming changes.

As a test, I used a run based on a single test, but the output was similar for the rest of the suite.

Using go test --tags=compliance -run "TestRemoteWrite/otelcollector/Gauge" -v ./

Go before the changes:

✓  go test --tags=compliance -run "TestRemoteWrite/otelcollector/Gauge" -v ./
=== RUN   TestRemoteWrite
=== RUN   TestRemoteWrite/otelcollector
=== RUN   TestRemoteWrite/otelcollector/Gauge
=== PAUSE TestRemoteWrite/otelcollector/Gauge
=== CONT  TestRemoteWrite/otelcollector/Gauge
Downloading https://github.com/open-telemetry/opentelemetry-collector/releases/download/v0.37.0/otelcol_darwin_amd64
    main_test.go:99:
        	Error Trace:	main_test.go:99
        	            				main_test.go:70
        	Error:      	Received unexpected error:
        	            	fork/exec : no such file or directory
        	Test:       	TestRemoteWrite/otelcollector/Gauge
--- FAIL: TestRemoteWrite (0.51s)
    --- FAIL: TestRemoteWrite/otelcollector (0.00s)
        --- FAIL: TestRemoteWrite/otelcollector/Gauge (0.51s)
FAIL
FAIL	github.com/prometheus/compliance/remote_write	1.291s
FAIL

After the changes:

✓  go test --tags=compliance -run "TestRemoteWrite/otelcollector/Gauge" -v ./
=== RUN   TestRemoteWrite
=== RUN   TestRemoteWrite/otelcollector
=== RUN   TestRemoteWrite/otelcollector/Gauge
=== PAUSE TestRemoteWrite/otelcollector/Gauge
=== CONT  TestRemoteWrite/otelcollector/Gauge
Downloading https://github.com/open-telemetry/opentelemetry-collector-releases/releases/download/v0.42.0/otelcol_0.42.0_darwin_amd64.tar.gz
Decompressing /var/folders/6w/5pg5lc_d2vzbwn40xlb_44d80000gp/T/2524267209
Extracting otelcol
--- PASS: TestRemoteWrite (15.60s)
    --- PASS: TestRemoteWrite/otelcollector (0.00s)
        --- PASS: TestRemoteWrite/otelcollector/Gauge (15.59s)
PASS
ok  	github.com/prometheus/compliance/remote_write	16.008s

[bmpandrade]

Sorry, I forgot to do the sign-off on the commit, there's way it shows above as force-pushed.

[codeboten]

Thanks for updating the download as well!