chore: enable the modernize linter

Signed-off-by: Mads Jensen <atombrella@users.noreply.github.com>

.github/env

@@ -1,2 +1,2 @@
 GOLANG_VERSION=1.25
-GOLANGCI_LINT_VERSION=v2.5.0
+GOLANGCI_LINT_VERSION=v2.8.0

.golangci.yml

@@ -18,12 +18,15 @@ linters:
   default: none
 
   enable:
+    # Please keep this list in alphabetic order
     - depguard
     - dupl
+    - exhaustive
     - gomodguard
     - govet
     - ineffassign
     - misspell
+    - modernize
     - nakedret
     - revive
     - sloglint
@@ -32,7 +35,6 @@ linters:
     - unused
     - usestdlibvars
     - usetesting
-    - exhaustive
 
   exclusions:
   

pkg/downloader/chart_downloader.go

@@ -597,8 +597,8 @@ func loadRepoConfig(file string) (*repo.File, error) {
 // stripDigestAlgorithm removes the algorithm prefix (e.g., "sha256:") from a digest string.
 // If no prefix is present, the original string is returned unchanged.
 func stripDigestAlgorithm(digest string) string {
-	if idx := strings.Index(digest, ":"); idx >= 0 {
+	if _, after, ok := strings.Cut(digest, ":"); ok {
-		return digest[idx+1:]
+		return after
 	}
 	return digest
 }