chore: Bump proxy to 1.0.28

[johanandren]

https://github.com/lightbend/kalix-proxy/issues/1727

[pvlugter]

LGTM, but looks like some unrelated TypeScript error showing up in CI:

node_modules/@types/node/globals.d.ts:72:13 - error TS2403: Subsequent variable declarations must have the same type.  Variable 'AbortSignal' must be of type '{ new (): AbortSignal; prototype: AbortSignal; abort(reason?: any): AbortSignal; timeout(milliseconds: number): AbortSignal; }', but here has type '{ new (): AbortSignal; prototype: AbortSignal; }'.

72 declare var AbortSignal: {
               ~~~~~~~~~~~

  node_modules/typescript/lib/lib.dom.d.ts:2071:13
    2071 declare var AbortSignal: {
                     ~~~~~~~~~~~
    'AbortSignal' was also declared here.


Found 1 error in node_modules/@types/node/globals.d.ts:72

[johanandren]

Looks like mismatch between typescript and dependencies, but I didn't touch the TS version here? ( microsoft/TypeScript#51567 )

[pvlugter]

Rebased on #438 changes