chore: update cgroups and ttrpc versions

- update github.com/containerd/cgroups to v1.1.0
- update github.com/containerd/ttrpc to v1.2.1

Signed-off-by: Akhil Mohan <akhilerm@gmail.com>

vendor/github.com/cilium/ebpf/btf/strings.go

@@ -0,0 +1,128 @@
+package btf
+
+import (
+	"bufio"
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+)
+
+type stringTable struct {
+	base    *stringTable
+	offsets []uint32
+	strings []string
+}
+
+// sizedReader is implemented by bytes.Reader, io.SectionReader, strings.Reader, etc.
+type sizedReader interface {
+	io.Reader
+	Size() int64
+}
+
+func readStringTable(r sizedReader, base *stringTable) (*stringTable, error) {
+	// When parsing split BTF's string table, the first entry offset is derived
+	// from the last entry offset of the base BTF.
+	firstStringOffset := uint32(0)
+	if base != nil {
+		idx := len(base.offsets) - 1
+		firstStringOffset = base.offsets[idx] + uint32(len(base.strings[idx])) + 1
+	}
+
+	// Derived from vmlinux BTF.
+	const averageStringLength = 16
+
+	n := int(r.Size() / averageStringLength)
+	offsets := make([]uint32, 0, n)
+	strings := make([]string, 0, n)
+
+	offset := firstStringOffset
+	scanner := bufio.NewScanner(r)
+	scanner.Split(splitNull)
+	for scanner.Scan() {
+		str := scanner.Text()
+		offsets = append(offsets, offset)
+		strings = append(strings, str)
+		offset += uint32(len(str)) + 1
+	}
+	if err := scanner.Err(); err != nil {
+		return nil, err
+	}
+
+	if len(strings) == 0 {
+		return nil, errors.New("string table is empty")
+	}
+
+	if firstStringOffset == 0 && strings[0] != "" {
+		return nil, errors.New("first item in string table is non-empty")
+	}
+
+	return &stringTable{base, offsets, strings}, nil
+}
+
+func splitNull(data []byte, atEOF bool) (advance int, token []byte, err error) {
+	i := bytes.IndexByte(data, 0)
+	if i == -1 {
+		if atEOF && len(data) > 0 {
+			return 0, nil, errors.New("string table isn't null terminated")
+		}
+		return 0, nil, nil
+	}
+
+	return i + 1, data[:i], nil
+}
+
+func (st *stringTable) Lookup(offset uint32) (string, error) {
+	if st.base != nil && offset <= st.base.offsets[len(st.base.offsets)-1] {
+		return st.base.lookup(offset)
+	}
+	return st.lookup(offset)
+}
+
+func (st *stringTable) lookup(offset uint32) (string, error) {
+	i := search(st.offsets, offset)
+	if i == len(st.offsets) || st.offsets[i] != offset {
+		return "", fmt.Errorf("offset %d isn't start of a string", offset)
+	}
+
+	return st.strings[i], nil
+}
+
+func (st *stringTable) Length() int {
+	last := len(st.offsets) - 1
+	return int(st.offsets[last]) + len(st.strings[last]) + 1
+}
+
+func (st *stringTable) Marshal(w io.Writer) error {
+	for _, str := range st.strings {
+		_, err := io.WriteString(w, str)
+		if err != nil {
+			return err
+		}
+		_, err = w.Write([]byte{0})
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// search is a copy of sort.Search specialised for uint32.
+//
+// Licensed under https://go.dev/LICENSE
+func search(ints []uint32, needle uint32) int {
+	// Define f(-1) == false and f(n) == true.
+	// Invariant: f(i-1) == false, f(j) == true.
+	i, j := 0, len(ints)
+	for i < j {
+		h := int(uint(i+j) >> 1) // avoid overflow when computing h
+		// i ≤ h < j
+		if !(ints[h] >= needle) {
+			i = h + 1 // preserves f(i-1) == false
+		} else {
+			j = h // preserves f(j) == true
+		}
+	}
+	// i == j, f(i-1) == false, and f(j) (= f(i)) == true  =>  answer is i.
+	return i
+}