fix(smithy-client): use uppercase for percent encodings

[trivikr]

Issue

Refs: #2499 (comment)

Description

Use uppercase for percent encodings

As per rfc3986 section 2.1, it should be "%2A"

The uppercase hexadecimal digits 'A' through 'F' are equivalent to
the lowercase digits 'a' through 'f', respectively. If two URIs
differ only in the case of hexadecimal digits used in percent-encoded
octets, they are equivalent. For consistency, URI producers and
normalizers should use uppercase hexadecimal digits for all percent-
encodings.

Testing

CI

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[alexforsyth]

Nice catch

[github-actions]

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