[otelmongo] bump semconv to 1.26.0

[prestonvasquez]

Problem Statement

otelmongo is currently using semconv/v1.17.0, suggest updating to semconv/v1.26.0.

Proposed Solution

key/value pair changes migrating from 1.17.0 to 1.26.0 include:

Old Func	New Func	Old Key	New Key	Notes
DBOperation	DBOperationName	db.operation	db.operation.name
DBName	DBNamespace	db.name	db.namespace
NetPeerName	NetworkPeerAddress	net.peer.name	network.peer.address	Currently the hostname is used for the peer name. Documentation suggest using the server address.
NetPeerPort	NetworkPeerPort	net.peer.port	network.peer.port
NetTransportTCP	NetworkingTransportTCP	net.transport	network.transport	Network transport no longer includes the ip_ portion defined on the deprecated net.trasnport. Instead, this value is either tcp or udp.
DBStatement	DBQueryText	db.statement	db.query.text	There is no deprecated analogue to `db.statement` according to the documentation. Db.query.text seemed like a natural fit.

Alternatives

Since these fields are deprecated, there is no alternative other than leaving the semconv version static.

Prior Art

NA

Additional Context

It's worth noting that this is a breaking change if telemetry key/values are considered stable.

[prestonvasquez]

A major version release of otelmongo should be planned before bumping to 1.26.0: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/versioning-and-stability.md#semantic-conventions-stability

OTEL_SEMCONV_STABILITY_OPT_IN is not intended for already stable releases, see here.