Update module github.com/gin-gonic/gin to v1.7.7

This MR contains the following updates:

Package	Type	Update	Change
github.com/gin-gonic/gin	require	patch	v1.7.4 -> v1.7.7

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Release Notes

gin-gonic/gin

v1.7.7

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BUGFIXES

• Fixed X-Forwarded-For unsafe handling of CVE-2020-28483 #​2844, closed issue #​2862.
• Tree: updated the code logic for latestNode #​2897, closed issue #​2894 #​2878.
• Tree: fixed the misplacement of adding slashes #​2847, closed issue #​2843.
• Tree: fixed tsr with mixed static and wildcard paths #​2924, closed issue #​2918.

ENHANCEMENTS

• TrustedProxies: make it backward-compatible #​2887, closed issue #​2819.
• TrustedPlatform: provide custom options for another CDN services #​2906.

DOCS

• NoMethod: added usage annotation (#​2832).

v1.7.6

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BUGFIXES

• bump new release to fix v1.7.5 release error by using v1.7.4 codes.

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