chore: bump golang.org/x dependencies to fix 21 CVEs

[Copilot]

21 CVEs (15 HIGH, 5 MEDIUM, 1 UNKNOWN) in golang.org/x/crypto, golang.org/x/net, and golang.org/x/sys affecting member-net-controller-manager.

Dependency updates

Package	Old	New	Severity
golang.org/x/crypto	v0.45.0	v0.52.0	8×HIGH, 5×MEDIUM
golang.org/x/net	v0.47.0	v0.55.0	7×HIGH
golang.org/x/sys	v0.38.0	v0.45.0	1×UNKNOWN

golang.org/x/sys is bumped to v0.45.0 (CVE fix threshold: v0.44.0) to satisfy transitive requirements from the updated crypto and net versions. go mod tidy also updated x/sync, x/term, x/text, and x/tools accordingly.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.35%. Comparing base (4fcffcf) to head (62f80e7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #370      +/-   ##
==========================================
+ Coverage   66.90%   67.35%   +0.44%     
==========================================
  Files          33       33              
  Lines        3783     3783              
==========================================
+ Hits         2531     2548      +17     
+ Misses       1077     1062      -15     
+ Partials      175      173       -2     

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