removing references to aws-sdk-go v1

[anglerfishlyy]

What this PR does:
Migrates the S3 backend from AWS SDK for Go v1 to v2, since v1 reached End of Support on July 31, 2025 and contains known security vulnerabilities (CVE-2020-8911, CVE-2020-8912).

Changes include:

• Updated imports and configuration in tempodb/backend/s3/s3.go
• Updated go.mod and go.sum to include AWS SDK v2 modules
• Synced vendor directory using go mod tidy and go mod vendor
• Verified functionality with go test ./tempodb/backend/s3 -v (all tests passed)

Which issue(s) this PR fixes:
Fixes #4706

Verification:
All unit tests for the S3 backend passed successfully.

root@DESKTOP-91QP86G:~/tempo# go test ./tempodb/backend/s3 -v
--- PASS: TestMarkBlockCompacted (0.03s)
--- PASS: TestFetchCreds (20.06s)
--- PASS: TestHedge (0.92s)
--- PASS: TestNilConfig (0.00s)
--- PASS: TestObjectBlockTags (0.00s)
--- PASS: TestObjectWithPrefix (0.01s)
--- PASS: TestListBlocksWithPrefix (0.01s)
--- PASS: TestObjectStorageClass (0.00s)
PASS
ok  	github.com/grafana/tempo/tempodb/backend/s3	21.057s

References

• AWS SDK for Go v1 End of Support: AWS Blog

Related: https://github.com/aws/aws-sdk-go-v2

Note

• The main S3 backend (s3.go) has been fully migrated to AWS SDK v2.

[javiermolinar]

Why don't do the same change for the s3_test.go? After removing all the references and running a go mod tidy && go mod vendor the github.com/aws/aws-sdk-go v1.55.7 is deleted from the mod file

 git diff
diff --git a/go.mod b/go.mod
index 483163a7e..bd12cc6df 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,6 @@ require (
        cloud.google.com/go/storage v1.56.0
        github.com/alecthomas/kong v1.12.1
        github.com/alicebob/miniredis/v2 v2.35.0
-       github.com/aws/aws-sdk-go v1.55.7
        github.com/cespare/xxhash/v2 v2.3.0
        github.com/cristalhq/hedgedhttp v0.9.1
        github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc

[javiermolinar]

@anglerfishlyy the title is a bit misleading, could we change it to something like "removing references to aws-sdk-go v1" ?

[javiermolinar]

Thank you for your contribution!