Enable unconvert linter

[alexandear]

Simplify code with unconvert linter:

go install github.com/mdempsky/unconvert@latest
unconvert -apply ./...

[Copilot]

Pull request overview

Enables the unconvert linter in golangci-lint and applies its suggested simplifications across the codebase by removing redundant type conversions (e.g., string(x) where x is already a string).

Changes:

• Enable unconvert in .golangci.yml.
• Remove redundant conversions in core packages (pgconn, pgproto3, pgtype, stdlib, root pgx) and update affected tests accordingly.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tracer_test.go	Removes redundant ctxKey conversions in tracer tests.
stdlib/sql.go	Simplifies column name assignment by removing redundant string() conversion.
rows.go	Simplifies RowToMap field-name handling by removing redundant string() conversion.
pgtype/uint64.go	Removes redundant uint64(...) conversions in encoding/decoding paths.
pgtype/tsvector.go	Simplifies bit-packing expression by removing redundant uint16(...) conversion.
pgtype/numeric.go	Removes redundant string(...) conversion in scientific scanning path.
pgtype/float8.go	Removes redundant string(...) conversion prior to ParseFloat.
pgtype/float4.go	Removes redundant string(...) conversion prior to ParseFloat.
pgproto3/describe.go	Removes redundant byte(...) conversion when assigning ObjectType.
pgproto3/close.go	Removes redundant byte(...) conversion when assigning ObjectType.
pgconn/pgconn_test.go	Updates tests to compare field names directly as string without conversion.
pgconn/pgconn.go	Removes redundant conversions in protocol version handling and error mapping.
named_args.go	Removes redundant namedArg(...) conversion when appending lexer parts.
conn.go	Removes redundant uint32(...) conversion when indexing by DataTypeOID.
.golangci.yml	Enables the unconvert linter.

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[jackc]

LGTM