OpenCensus dependencies failing to resolved due to certificate expiration

[Madrigal]

Describe the bug
New install of Athens will start failing since the certificate for go.opencensus.io expired. See https://www.sslshopper.com/ssl-checker.html#hostname=go.opencensus.io

Error Message
Used GOPROXY=direct to ensure no caching

$ GOPROXY=direct go install github.com/gomods/athens/cmd/proxy@v0.15.4
go: github.com/gomods/athens@v0.15.4 requires go >= 1.22; switching to go1.22.11
go: downloading go.opencensus.io v0.24.0
../go/pkg/mod/contrib.go.opencensus.io/exporter/jaeger@v0.2.1/jaeger.go:31:2: unrecognized import path "go.opencensus.io": https fetch: Get "https://go.opencensus.io/?go-get=1": tls: failed to verify certificate: x509: certificate has expired or is not yet valid: “go.opencensus.io” certificate is expired

To Reproduce
Steps to reproduce the behavior:
Run GOPROXY=direct go install github.com/gomods/athens/cmd/proxy@v0.15.4

Expected behavior
go install should succeed

Environment (please complete the following information):

• OS: [e.g. Linux 64bit]
• Go version :
• Proxy version :
• Storage (fs/mongodb/s3 etc.) :

Additional context
OpenCensus is being sunsetted in favor of OpenTelemetry, so unsure if they'll renew this certificate. There have been some efforts at #1771 to move to OpenTelemetry.