Bump golang.org/x/net from 0.20.0 to 0.23.0 in /_examples/mvc/overview

[dependabot]

Bumps golang.org/x/net from 0.20.0 to 0.23.0.

Commits

• c48da13 http2: fix TestServerContinuationFlood flakes
• 762b58d http2: fix tipos in comment
• ba87210 http2: close connections when receiving too many headers
• ebc8168 all: fix some typos
• 3678185 http2: make TestCanonicalHeaderCacheGrowth faster
• 448c44f http2: remove clientTester
• c7877ac http2: convert the remaining clientTester tests to testClientConn
• d8870b0 http2: use synthetic time in TestIdleConnTimeout
• d73acff http2: only set up deadline when Server.IdleTimeout is positive
• 89f602b http2: validate client/outgoing trailers
• Additional commits viewable in compare view

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